What Is TExES 238 Certification?

What TExES 238 Certification Actually Is

TExES Life Science 7-12 (238) is the content-knowledge exam Texas uses to certify secondary science teachers in life science. Passing it does not hand you a certificate all by itself - it verifies that you know the biology, genetics, ecology, and science-education content required to teach grades 7 through 12 in Texas public schools. It is one of several subject-specific TExES content exams, and it is built entirely around a 2019 exam framework of 20 competencies organized into six domains aligned to the Life Science 7-12 Standards I-XI and the Texas Essential Knowledge and Skills (TEKS).

If you are still mapping out the basics before diving into prep work, the companion piece What Is TExES 238? and the shorter explainer TExES 238 Meaning cover the naming and scope in more detail. This article focuses specifically on what the certification represents, how the exam is structured, and who actually needs it.

Who Governs and Administers the Exam

The Texas Education Agency (TEA) and the State Board for Educator Certification set the policy and standards behind TExES 238. Pearson (through its Evaluation Systems division) develops and administers the actual test as a computer-administered test (CAT) at Pearson VUE testing centers across Texas and nationwide, available by appointment year round rather than on fixed testing windows. That flexibility matters for candidates juggling coursework or a teaching internship - you schedule when you're ready rather than waiting for a specific date on the calendar.

Exam Format, Fee, and Registration Mechanics

The exam consists of 100 selected-response questions. Some of those items are unscored field-test questions used to evaluate future exam content, but only the scored questions count toward your final scaled score - you won't know which is which while testing, so every question deserves full attention. Total appointment time runs 5 hours: 15 minutes for the CAT tutorial and compliance agreement, plus 4 hours 45 minutes of actual testing time. There is no calculator or reference sheet provided, so recall and application have to come from your own preparation.

• Exam fee: $116, with no separate member or non-member pricing tiers.
• Registration validity: 170 days from the date you register.
• Withdrawal refund: the exam fee minus a $25 processing charge.
• Attempt limits: five attempts allowed, with a required 30-day wait between attempts; a TEA test-limit waiver is needed to test beyond five.
• Score reporting: scores post at 10:00 p.m. Central on the published score report date.

You also cannot simply walk in and register on your own initiative - candidates must be approved to test either through an educator preparation program (EPP) or directly by TEA. For a full walkthrough of eligibility steps, see TExES 238 Requirements 2026: Eligibility, Prerequisites & How to Qualify. If you want the complete cost picture including retake fees and prep materials, check TExES 238 Certification Cost 2026: Complete Pricing Breakdown.

The Six Domains That Define the Content

Content on TExES 238 is organized into six domains, and understanding their relative weight is the single most useful planning tool a candidate has. Three domains tie for the heaviest weight at 20% each, meaning roughly 60 of the 100 questions come from just these three areas.

The remaining three domains still account for nearly half the exam and cannot be neglected:

• Domain 1: Scientific Inquiry and Processes (15%) - experimental design, lab safety, and the nature of scientific reasoning.
• Domain 5: Interdependence of Life and Environmental Systems (15%) - ecosystems, energy flow, biogeochemical cycles, and human impact.
• Domain 6: Science Learning, Instruction and Assessment (10%) - pedagogy specific to teaching life science, including assessment design and misconception correction.

For a competency-by-competency breakdown of every domain, read TExES 238 Exam Domains 2026: Complete Guide to All 6 Content Areas.

Passing Score and What It Signals

TExES 238 uses a scaled score range of 100 to 300, and the passing score is 240. Because scoring is scaled rather than a raw percentage, a "passing" performance doesn't necessarily mean answering 80% of questions correctly - the scaling accounts for item difficulty across scored questions. For the full mechanics of how raw performance converts to the 240 threshold, see TExES 238 Passing Score 2026: Exactly What You Need to Pass.

A deeper look at what drives that pass-rate gap, including which domains trip up the most candidates, is available in TExES 238 Pass Rate 2026: What the Data Shows and How Hard Is the TExES 238 Exam? Complete Difficulty Guide 2026.

Who Needs This Certification

TExES 238 is required for anyone seeking to teach life science, biology, or related science courses to students in grades 7 through 12 in Texas public schools. This includes:

• Traditional undergraduate education majors completing a life science certification track
• Career-changers entering teaching through an alternative certification or post-baccalaureate program
• Out-of-state or out-of-country educators seeking Texas certification reciprocity in life science
• Current Texas teachers adding a life science certification to an existing certificate

School districts, charter networks, and increasingly some private schools use passage of TExES 238 as a hiring signal for secondary biology and life science positions. If you're weighing the career upside before committing time and money to prep, Is the TExES 238 Certification Worth It? Complete ROI Analysis 2026 and TExES 238 Salary Guide 2026: Complete Earnings Analysis look at that decision in more depth. For a sense of the job market itself, see TExES 238 Jobs.

The Certification Pathway From Approval to Classroom

Passing TExES 238 is a necessary step, but it's not the entire certification pathway. Here's how the pieces fit together:

1. Program approval: You must be approved to test either through an EPP or directly by TEA before you can register.
2. Content exam: Pass TExES 238 with a scaled score of 240 or higher.
3. Pedagogy exam: A first Texas classroom certificate also requires passing the PPR EC-12 (160) pedagogy exam, which covers instructional and professional practice separately from life science content.
4. Certificate issuance: Once both exams and program requirements are satisfied, TEA issues the standard certificate.

Missing this two-exam structure is a common planning mistake - candidates sometimes assume TExES 238 alone unlocks certification, then are surprised by the PPR requirement late in the process. Build both exams into your timeline from the start, and check TExES 238 Exam Dates 2026: Testing Windows, Deadlines & Scheduling for scheduling logistics around registration validity and appointment availability.

Preparing for Domain-Heavy Content

Because three domains carry the bulk of the weight, an efficient study plan spends proportionally more time there without ignoring the rest. A simple sequencing approach works well: front-load Cell Structure and Processes and Heredity and Evolution of Life early since they build on each other biochemically, then move into Diversity of Life, and close with Scientific Inquiry, Interdependence of Life and Environmental Systems, and Science Learning, Instruction and Assessment as integrative review.

For a more granular week-by-week plan built around the exam's structure, see TExES 238 Study Guide 2026: How to Pass on Your First Attempt. A condensed reference for last-minute review sits in TExES 238 Cheat Sheet 2026: One-Page Review of Must-Know Facts, and running realistic practice questions on our practice test platform before test day helps you get comfortable with the selected-response format and pacing before you're sitting at a Pearson VUE terminal with the clock running.

After You Pass: Certificate Validity and Renewal

Passing TExES 238 and the required pedagogy exam leads to a standard Texas certificate valid for five years. Renewal happens through the ECOS system and requires 150 continuing professional education (CPE) clock hours for classroom teachers during that renewal cycle. This is a downstream detail worth knowing early, since it affects long-term career planning beyond the initial certification exam itself. If you want a single reference point covering the certification's full scope - from eligibility through renewal - TExES 238 Certification and What Is TExES 238 Certification? both consolidate these details, and TExES 238 Training outlines formal preparation program options if self-study isn't the right fit.

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