i logged in 8 hours a day from may-august preparing for the august 08 test. i read, re-read every section in kaplan. alternated 3 bio/2 chem every day. did all the review questions for each section. went over each section that i had gotten wrong. after i went through the whole book, i took a practice every saturday morning at 8am to get used to it. this helps with timing and pacing yourself too. i had cliffs 5 practice tests, used the kaplan diagonistic test, used the kaplan final review test, bought some old books off half.com and amazon and use those books (came out to about $4 a book including shipping since they were old editions). during the week following every practice test, i corrected each one. and redid and worked out the questions, which worked well for chemistry and quant. after that, just read the sections in which i did poorly...chemistry for me.
of course that was just for the first test. i got an 83 composite, but my chem and RC scores were on the lower side, so i retook it in october. for that, i realized i had it coming up 3 weeks prior, so i just went over chem and RC. chem shot up 20 points, RC stayed the same...composite went up to 89. shenandoah called me and told me RC was too low, so i took it in january. i really didnt bother studying anything besides rc...surpassed shenandoah's minimum, and got 92 composite. i actually stopped caring about the test about halfway through verbal.
so really...just relax, but make an honest attempt to know your stuff