If you cannot work the problem quickly, without hesitation, then take the review link offered. After your review, come back to this page and try to work the next problem. Check your answer. Continue this procedure for the complete math section. Then, move onto the introduction to astronomical and scientific methods.
Students arrive at universities with a broad range of math backgrounds.
It may be that you do not need much of a math review. In that case, you may wish to go directly to the actual problems. Note, however, that the scientific methods section includes applications specific to astronomy. Every student should cover that section completely. Because the energy is the product of the mass and a very large number.