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The two get confused constantly, usually by people at the very start who have heard both names and assume they are stages of the same thing. They are not related exams. They are bookends.
Where each sits
The TEAS is an entrance exam. You sit it before nursing school, as part of your application, and it tests general academic readiness: reading, maths, science and English at roughly high-school level.
The NCLEX is a licensing exam. You sit it after you graduate, and passing it is what makes you a registered or practical nurse. It tests clinical judgement: what you would do for this patient, in this situation, right now.
How they differ structurally
- Format. The TEAS is a fixed-length exam of 170 questions. The NCLEX is adaptive: it selects each question based on how you answered the previous ones, and it stops when it is confident about you.
- Scoring. The TEAS gives a percentage, and your school decides what is good enough. The NCLEX gives pass or fail against a national standard, with no score to negotiate.
- Content. Academic subjects against clinical decision making.
- Stakes. A weak TEAS costs you a place this cycle. A failed NCLEX delays your licence and your first job.
The HESI confusion, while we are here
There are two different HESI exams and that does not help anyone. The HESI A2 is an entrance exam, an alternative to the TEAS. The HESI Exit exam is something you meet near the end of a nursing programme as an NCLEX predictor. If someone tells you the HESI is hard, ask which one they mean.
What this means for how you prepare
If you are applying to nursing school, your exam is the TEAS or the HESI A2, and your school tells you which. Preparation is content revision and timed practice. The NCLEX is years away and worrying about it now is wasted energy, because you will spend a programme learning the material it tests.
To work out which entrance exam you need, start with the nursing school entrance exam guide, or compare the two directly in TEAS against HESI A2.