Two Exams, Two Very Different Jobs
If you're starting your nursing journey, you'll hear about two major exams: the HESI A2 and the NCLEX. They sound similar and both relate to nursing, so it's easy to confuse them. But they serve completely different purposes at opposite ends of your nursing education. Understanding the difference early helps you focus on the right exam at the right time.
In the simplest terms: the HESI A2 gets you into nursing school, while the NCLEX gets you your nursing license after you graduate. This guide breaks down every key difference so you know exactly what each exam demands. If you're also weighing entrance exams, don't miss our comparison of the HESI A2 vs the TEAS.
Purpose: Admission vs. Licensure
This is the fundamental difference, and it shapes everything else about the two exams.
The HESI A2 (Admission Assessment) is an entrance exam. Nursing programs use it to evaluate whether applicants have the foundational academic skills—math, reading, vocabulary, grammar, and science—needed to succeed in a rigorous nursing curriculum. You take it before you're admitted. Schools set their own required scores, which you can learn about in our guide to HESI A2 score requirements for nursing schools.
The NCLEX (National Council Licensure Examination) is a licensure exam. After you graduate from an accredited nursing program, you must pass the NCLEX to become a licensed nurse—either the NCLEX-RN (registered nurse) or NCLEX-PN (practical nurse). It determines whether you're competent and safe to practice nursing. You take it after you finish your education.
When You Take Each Exam
The timeline makes the distinction crystal clear:
- HESI A2: Taken during the application process, before nursing school begins. It's one of your first major milestones.
- NCLEX: Taken after graduating from nursing school, as the final gate before licensure and employment.
In other words, years often separate these two exams. You'll conquer the HESI A2 first, complete your entire nursing program, and only then prepare for the NCLEX. If you're just beginning, the HESI A2 is your immediate focus—map out your prep with our 30, 60, and 90-day study plans.
What Each Exam Tests
HESI A2 Content
The HESI A2 measures general academic readiness across several subjects, which schools mix and match:
- Mathematics — basic math, fractions, decimals, ratios, and dosage calculations
- Reading Comprehension — understanding and analyzing passages
- Vocabulary & General Knowledge — including medical terminology
- Grammar — parts of speech, sentence structure, and usage
- Science — biology, chemistry, anatomy and physiology, and sometimes physics
For a complete rundown, see our breakdown of HESI A2 sections, questions, and time limits.
NCLEX Content
The NCLEX, by contrast, tests clinical nursing knowledge and judgment built throughout your degree. It focuses on categories such as safe and effective care, health promotion, psychosocial integrity, and physiological integrity. Rather than measuring foundational academics, it evaluates whether you can apply nursing concepts to real patient-care scenarios safely.
This is why the HESI A2 feels like a college-readiness test while the NCLEX feels like a test of professional competence—they're measuring fundamentally different things.
Format and Structure
The two exams are built very differently:
- HESI A2: A fixed-format exam with a set number of questions per section, mostly multiple choice. Schools choose which sections you complete, and there may be optional Learning Style and Personality Profile sections. You typically receive your scores quickly.
- NCLEX: Uses Computerized Adaptive Testing (CAT), meaning the difficulty of each question adjusts based on your previous answers. The number of questions you receive can vary, and the exam ends once the system determines whether you've demonstrated competence. It also includes newer item types beyond standard multiple choice.
The adaptive nature of the NCLEX is one of its most distinctive features—no two test-takers necessarily answer the same number or set of questions.
Scoring and Passing
Scoring works very differently for each exam:
- HESI A2: You receive percentage scores for each section plus a composite score. There's no universal passing score—each nursing school sets its own minimum, often in the 75–80% range for individual sections. Learn more in our guide on what passing score you need and how HESI A2 scoring works.
- NCLEX: Scored on a pass/fail basis using a standardized competency threshold set by the National Council of State Boards of Nursing. There's no percentage grade—you either demonstrate the required level of competence or you don't.
Retake Policies
Both exams allow retakes, but the rules differ. For the HESI A2, retake limits and waiting periods are set by your individual nursing program—details we cover in our guide on how many times you can take the HESI A2 and our retake strategy guide. The NCLEX has its own nationally governed retake rules, typically including a mandatory waiting period between attempts and annual limits.
Quick Comparison Table
| Feature | HESI A2 | NCLEX |
|---|---|---|
| Purpose | Nursing school admission | Nursing licensure |
| When taken | Before nursing school | After graduation |
| Tests | Academic foundations | Clinical nursing competence |
| Format | Fixed, mostly multiple choice | Computerized adaptive testing |
| Scoring | Percentage + composite | Pass/fail |
| Passing standard | Set by each school | National competency threshold |
Which One Should You Focus On Now?
If you haven't started nursing school yet, the answer is simple: focus entirely on the HESI A2. It's the exam standing between you and admission, and a strong score can make your application far more competitive. The NCLEX is years away and depends on knowledge you'll build throughout your program—there's no benefit to worrying about it now.
Channel your energy into mastering the HESI A2 sections your school requires. Start by assessing your current level with our free practice questions across all subjects, then build a focused plan and avoid the common mistakes that cost students points.
The Bottom Line
The HESI A2 and NCLEX are both nursing exams, but they sit at opposite ends of your journey. The HESI A2 is an entrance exam that tests academic readiness and gets you into nursing school; the NCLEX is an adaptive licensure exam that confirms you're ready to practice as a nurse after graduation. One opens the door to your education, the other launches your career. Right now, your job is to earn the HESI A2 score your program requires—so build a smart study plan, practice consistently, and take that first step with confidence.