What happens next?

How to deal with exam stress
Know what is expected of you.
Be sure to consult your syllabus or ask your instructor what material you will be responsible for. If you have a concrete sense of what you will be tested on, the future test will feel less vague and more like something you can handle.

OPT:
(A). Know that concepts will change over time. Some concepts will start working faster then others and you will notice that things will still be slightly different over time.
(B). If you aren't clear on anything, ask your teacher. Teachers would much rather answer questions than have their students proceed without understanding what's expected.
(C). Take the test as soon as possible. If you're dreading the beginning of the test or just set aside a few days to dedicate to it, that can often be unavoidable.
(D). Consult your syllabus or ask your instructor if there are rules about exam preparation. If you are not a very satisfied student, then an improved class or a new curriculum may be for you to enjoy.
(B).