I am testing whether a certain learning intervention affects student achievement. I have two groups of students (control and experimental) with 16 students each. I have their pre-test and post-test scores. I intend to compare the two groups' pre-test scores using independent t-test; the two groups' post-test scores using independent t-test as well, the improvement of scores within groups using paired t-tests, and finally compare the two groups' gain scores (post-test score minus pre-test score) using independent t-test. Are the tests I intend to use correct And should I correct for multiple testing? How? (I'm a research newbie). Thank you!