so i was in my bed replaying some of the problems on tuesday's 150 point chemistry exam i had. I kept trying to figure out some olf the reasons i had trouble with certain problems. In the process of doing this, i realized that i made a stupid mistake on a problem i thought i had gotten right!!! I checked my work when i was done with the test, so im kind of upset i didnt catch this :(. my goal is an A in this class, so i cant afford stupid mistakes like this. anybody have any tips? i have currently been doing this in math too. i have trouble adding fractions LOL.