I know the material inside and out, but then make dumb mistakes on tests.... I learn the material backwards and forwards, understand all of the concepts, but then when I take tests I make little slip ups that cost lots of points, like units conversions or I screw up obvious simple little formulas. To show that I truly know the material, I rework the problems in my head after taking the test as I walk home and realize all of the mistakes I made, and I realize why certain answers didn't work out right... For instance, I made a really really dumb mistake on today's optoelectronics test....I calculated wavelength by taking the reciprocal of frequency....since I am a bad test taker I overlooked this mistake...I did not realize I made the mistake until after the test was over and I was walking down the hallway.... And don't tell me it's because I didn't work enough problems or did not read the assigned readings or because I didn't understand the material....this is not the case. I am going to talk to the prof about it tomorrow...maybe he can go easy on me...I dunno. You might ask, "how the hell can you think wavelength = 1/frequency, under ANY circumstance??" Well, I am a bad test taker....under other circulstances I would not make that error. Honestly, grades are useless methods for benchmarking a person's understanding and mastery of a subject. Does anyone have any advice?