I did pretty well on general Kaplan practice test for quant, getting not more than two or three questions wrong; when I actually took the test today, i got a friggin 550. Absolutely terrible. I was compeltely unprepared for following types of questions -
integer sequences - they gave a sigma sequence and asked for sum of 100 elements.
three venn-diagram-esque questions - given fifty people like rasberries , thirty like blueberries and rasberries, fifteen like rasberries blueberries and cherries, how many people like cherries and rasberries? (made up question)
The Kaplan practice math tests I took had very few of the above types of questions, so I assumed I'd either be able to punt it and not affect my score much, or derive the correct stuff on the spot. Neither of these turned out to be true. i got 2 sequence/summation questions, 3 venn-diagram-esque questions.
i got off to a pretty strong start and the questiosn got hard quickly. I completely folded and failed to deliver. i've taken up to calc 4 (engineer) and after i got home i tried to do as many of those GRE problems i knew i got wrong , from memory. i realized i overthought half of them and flat out panicked on two others. I kept trying to remember and derive closed formulas for harmonic series, exponential series, etc, for first type of question. For second type of question I kept trying to recollect/derive generic equations for set intersection/union/difference that i knew from discrete math and probability theory, with horrendous results.
Ater I got home and calmly redid problems (often just talkign high school approach of enumerating things, working out sum at 1, sum at 2, seeing pattern, etc) I knew i got wrong i got each of those similar problems in less than three minutes a piece. ****. I'm retaking it again soon as I get chance... my vocab wasnt bad (680) but hopefully i can bump that up a bit too... any way i can get ETS to cancel my crap scores for the day?
definitely humbled me a bit tho; i did well on SAT and doing okay in school; this was wakeup call :( I'm def buying a few more pure-math GRE prep books from other guys now...