How much emphasis is placed on grade?

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I get B+ to an A- in every math and science course I have and I got in. My problem is not that I do not understand material, but I overlook minor details that lead to mistakes. My SAT scores, AMC12 score, AIME score, and math/science awards helped me though.

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<p>What are good scores on these? I have had several slip-ups in math/science, but my AMC-12 (126.5) and AIME (6) scores show that I know what I'm doing. I'm guessing this will make up for some slightly lower grades in math and science...</p>