- What Actually Drives Your Earning Potential
- The Certification Pathway: What It Actually Costs
- Why Domain Weighting Matters for Classroom Value
- Who Hires TExES 238-Certified Educators
- Stacking Credentials for Long-Term Value
- Renewal, Longevity, and Protecting Your Investment
- A Domain-Aware Prep Timeline
- Frequently Asked Questions
- Passing TExES 238 (score of 240+) is the credentialing gate to Texas life science teaching jobs, not a salary formula itself.
- Three domains - Cell Structure, Heredity and Evolution, Diversity of Life - make up roughly 60% of the exam and the bulk of daily classroom content.
- The exam costs $116 per attempt, with a 30-day wait between the five allowed attempts.
- A first Texas classroom certificate also requires passing PPR EC-12 (160), which affects your total path timeline and cost.
What Actually Drives Your Earning Potential
Search for a "TExES 238 salary" and you'll find a lot of noise and very little that's specific to Texas life science certification. Here's the honest starting point: passing the TExES Life Science 7-12 (238) exam doesn't set a pay figure - it satisfies a certification requirement set by the Texas Education Agency (TEA) and the State Board for Educator Certification. What actually shapes your paycheck as a certified life science teacher is a combination of the hiring district's pay scale, your years of service, your degree level, any stipends for coaching or sponsoring clubs, and whether you hold additional certifications beyond the base science credential.
What the TExES 238 credential does control is access. Without a passing score of 240 or higher, you cannot be recommended for a standard Texas certificate in this content area, and without that certificate, most public school life science postings in grades 7-12 aren't open to you. In that sense, the exam is a gate, not a raise. Understanding exactly what's behind that gate - the content, the format, the retake rules - is the more useful lens for anyone weighing whether this certification path is worth pursuing. For a deeper breakdown of that value question, see Is the TExES 238 Certification Worth It? Complete ROI Analysis 2026.
The Certification Pathway: What It Actually Costs
Before earnings enter the picture, there's an upfront investment to understand. The TExES 238 exam is developed and administered by Pearson (Evaluation Systems) as a computer-administered test, delivered at Pearson VUE centers across Texas and nationwide by appointment. There's a single flat fee - no member or non-member pricing tiers - and the mechanics of registration matter for anyone budgeting toward certification.
| Cost/Timing Factor | Detail |
|---|---|
| Exam fee | $116 per attempt |
| Total appointment time | 5 hours (15 min tutorial/agreement + 4 hrs 45 min testing) |
| Question count | 100 selected-response items (some unscored field-test questions) |
| Passing score | 240 on a 100-300 scale |
| Attempts allowed | 5, with a 30-day wait between attempts |
| Registration validity | 170 days |
| Withdrawal refund | Exam fee minus $25 |
Every retake adds another $116 and a mandatory 30-day wait, so a failed first attempt has a real cost in both money and time-to-hire. That's precisely why TEA's statewide data on this exam - 47% first-attempt and 56% best-attempt pass rates for the 2024-2025 program year, the lowest among the major secondary science content exams - matters so much to anyone planning a job-search timeline. Review the full numbers in TExES 238 Pass Rate 2026: What the Data Shows, and get a full cost breakdown including retake scenarios in TExES 238 Certification Cost 2026: Complete Pricing Breakdown.
Also worth budgeting for: a first Texas classroom certificate requires passing PPR EC-12 (160) in addition to TExES 238. Candidates must be approved to test by an educator preparation program or by TEA before either exam can be scheduled - see the full eligibility rundown in TExES 238 Requirements 2026: Eligibility, Prerequisites & How to Qualify.
Key Takeaway
Budget for more than one exam attempt. At $116 per sitting with a mandatory 30-day gap, a single missed attempt can push your certification - and your first paycheck as a certified teacher - back by a month or more.
Why Domain Weighting Matters for Classroom Value
If earnings are tied to being hired and retained as a competent life science teacher, then the content you master for TExES 238 is directly the content you'll teach and be evaluated on. The 2019 Life Science 7-12 exam framework organizes the test into 20 competencies across six domains, aligned to the Life Science 7-12 Standards and the TEKS. Three domains tie for the heaviest weight at 20% each, meaning roughly 60 of the 100 scored questions come from this trio:
Cell Structure and Processes (20%)
Biomolecules, prokaryotic and eukaryotic cell structures, transport and homeostasis, photosynthesis and respiration, and cell cycle/differentiation.
- High-value: membrane transport mechanisms and energy pathways show up repeatedly in classroom labs and on the exam alike.
Heredity and Evolution of Life (20%)
DNA/RNA structure, Mendelian and molecular genetics, mutation, natural selection, speciation, and fossil/molecular evidence.
- High-value: expect items that connect molecular mechanisms to macro-evolutionary evidence, not isolated vocabulary recall.
Diversity of Life (20%)
Taxonomy, plant and animal systems, homeostasis, and the biology of behavior.
- High-value: comparative physiology across taxa is a common thread tested from multiple angles.
The remaining domains - Scientific Inquiry and Processes (15%), Interdependence of Life and Environmental Systems (15%), and Science Learning, Instruction and Assessment (10%) - round out the framework and matter just as much for day-to-day teaching effectiveness, even at lower question counts. A full walkthrough of all six domains, with specific TEKS alignment notes, lives in TExES 238 Exam Domains 2026: Complete Guide to All 6 Content Areas.
Why does this matter for your career trajectory rather than just your test score? Districts hiring for life science positions are, in effect, trusting that a passing TExES 238 score means you can competently teach cell biology, genetics, and organismal diversity from day one. Strong command of these three heavyweight domains is what makes you a low-risk hire and a candidate who can step into an existing curriculum sequence without a long ramp-up period.
Who Hires TExES 238-Certified Educators
TExES Life Science 7-12 certification is the credential Texas public middle and high schools require for teachers assigned to biology, life science, and related 7-12 science courses. Practically, that means:
- Public school districts staffing middle school life science and high school biology sections
- Charter schools operating under Texas certification requirements
- Educator preparation programs and alternative certification programs recommending candidates for a first classroom assignment
Because the certificate is issued through TEA and renewed through ECOS, it travels with you across Texas districts without needing to be re-earned - a meaningful portability advantage if you relocate within the state. For a broader look at where this credential fits in the job market, see TExES 238 Jobs, and for a plain-language overview of what the certification represents, What Is TExES 238 Certification? covers the basics.
Stacking Credentials for Long-Term Value
One realistic way certified teachers increase their long-term earning trajectory is by stacking credentials rather than relying on a single certification. Common patterns among life science-certified teachers include adding a second science content certification, pursuing coaching or extracurricular sponsorship roles, or moving into department leadership as experience accrues. None of these are guaranteed outcomes, and none are promised by TExES 238 itself - but they're realistic paths that a valid, current life science certificate keeps open.
Before stacking anything, it helps to have absolute clarity on the score you need on this exam. The passing threshold is 240 on a 100-300 scale, and understanding how that scaled score is built from 100 selected-response items (with some unscored field-test questions mixed in) can change how you interpret a diagnostic practice score. Full detail is in TExES 238 Passing Score 2026: Exactly What You Need to Pass.
Renewal, Longevity, and Protecting Your Investment
A Texas standard certificate earned through TExES 238 is valid for five years. Renewal runs through ECOS (the state's online certification system) and requires 150 CPE clock hours for classroom teachers during that period. This is a meaningful factor in long-term career value: the certification isn't a one-time credential you earn and forget - it requires ongoing professional development to remain active, which in turn keeps your qualifications current and your position secure.
Treat the $116 exam fee, the study time, and the CPE hours over five years as a single package: the total cost of staying credentialed to teach life science in Texas. Viewed that way, the exam fee itself is a small fraction of the total investment in a multi-year teaching career, and it's the piece most directly within your control to get right on the first attempt.
Key Takeaway
A first-attempt pass avoids the $116-per-retake cost and the 30-day waiting period, getting you certified and eligible for hire faster - which matters more to your timeline than any single number on a salary chart.
A Domain-Aware Prep Timeline
Rather than a generic study calendar, allocate your preparation weeks in proportion to how the exam is actually weighted. Since Cell Structure and Processes, Heredity and Evolution of Life, and Diversity of Life together account for roughly 60% of the 100 scored questions, they deserve the majority of your review time - not equal time with the three lower-weighted domains.
Cell Structure and Processes
- Biomolecules, membrane transport, and energy pathways (photosynthesis/respiration)
- Cell cycle, differentiation, and prokaryotic vs. eukaryotic comparisons
Heredity and Evolution of Life
- Molecular and Mendelian genetics, mutation types
- Natural selection, speciation, and fossil/molecular evidence for evolution
Diversity of Life
- Taxonomy and classification systems
- Plant/animal system comparisons and biology of behavior
Remaining Domains + Full Timed Review
- Scientific Inquiry, Interdependence of Life and Environmental Systems, Science Learning/Instruction/Assessment
- One full-length timed practice run under the real 4 hr 45 min testing window
For a complete study framework built around this same logic, see TExES 238 Study Guide 2026: How to Pass on Your First Attempt. And if you're still gauging how demanding this particular exam is relative to other secondary science certifications, How Hard Is the TExES 238 Exam? Complete Difficulty Guide 2026 lays out the specifics behind that lowest-among-major-science-exams pass rate.
Whatever timeline you build, run at least one full practice session under realistic conditions using a full-length TExES 238 practice test so the 100-item, near-five-hour format doesn't catch you off guard on test day. Repeating targeted practice sets on the three heavyweight domains through our TExES 238 practice test platform is one of the most direct ways to convert study time into a passing scaled score.
Frequently Asked Questions
No. The exam is a certification requirement administered by TEA and Pearson; it does not set or guarantee pay. Salary depends on the hiring district's pay scale, your degree, experience, and any stipends - factors entirely separate from the exam itself.
Yes. A first Texas classroom certificate also requires passing the PPR EC-12 (160) pedagogy exam in addition to the TExES 238 content exam.
Each attempt costs $116, and you must wait 30 days between attempts. Candidates get five total attempts before needing a TEA test-limit waiver.
Texas standard certificates are valid for five years and renew through ECOS, requiring 150 CPE clock hours for classroom teachers.
Cell Structure and Processes, Heredity and Evolution of Life, and Diversity of Life each carry 20% weight and together make up roughly 60% of the 100 scored questions, making them the highest-priority review areas.