as for studying - do whatever works best for you
but as for a test taking tip that i think really helped me do well was counting the number of each letter choice -- it may seem ridiculous or superstitious - but when i felt myself running out of time, with unanswered questions, or questions i was unsure about, i would count the number of A's, B's, C's, and D's to try to make them all about even -- I wouldn't actually change any answers that I was sure about, but if I noticed that there was a significantly lower number of A's than all the other answers - I would fill in the ones I left blank with A's (as long as the answer wasn't ridiculous). I would never waste time doing this when I have time to answer questions right, but when I had time at the end of a section, and was stuck without a clue on a few questions, this helped me out ...