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[Merlin]

thanks, but do i need to memorize formulas???

I'm not sure why you're focused on that specific question, but to answer it, my understanding is that they do not test you on your knowledge of specific formulas (as in here are three formulas, which one is correct), but unless you already understand (or can derive) the formulas, you will probably need to memorize some of them to solve those problems successfully. If you have problems with memorizing formulas, you should review the Khan Academy materials, as they show how to derive some of the formulas by working back from the problems themselves.

As the previous posters have mentioned, the only way to know what is on the test is to review the official DSST test guide, which tells you what is on the test and what textbooks were used to prepare the test questions.