Get the problem sheets from the first two tests out, and do all the problems again.
Since this is not official, it's not wrong to check in the book when you're stuck, and indeed that could be more help than harm.
However, try after you've done them all to do at least the ones you referenced to the book for over again, this time without referring.
If you have to keep on referring, you would probably want to read everything important over again, and make sure it all makes sense.
If you can do some memorization, that would also be likely to help you - it wasn't until the last minute - literally - that I remembered that the summation of u^n/n! is e^u - I almost missed that problem on today's test, and I think more memorization can help prevent those dilemmas.
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