ESAT, NSAA and ENGAA: sit the test your course names
NSAA and ENGAA were earlier Cambridge assessments. Many of those courses now list ESAT.
Read the course page
NSAA was the Natural Sciences Admissions Assessment. ENGAA was the Engineering Admissions Assessment. ESAT is the current Engineering and Science Admissions Test used by many of those courses. The name on the page is the test to book.
The clocks are not the same
- ESAT: 27 questions in 40 minutes, one module at a time.
- Later NSAA: Section 1 and Section 2, 60 minutes each.
- Later ENGAA: Section 1 in two parts, then Section 2, 60 minutes each.
Older papers are useful for the style of reasoning. They are not a substitute for the module your course lists this year.