Relative to the rest of my peers, analytical chemistry and biochemistry were probably my strongest. In fact, I think instrumental chemistry was the only class where I ever had *the* highest score on an exam, and in that one it happened twice. I only got a B+ in calc II, but even though I lack the mental agility and care for details in integrating some trigonometric function rotated 270 degrees about the x-axis (which meant a low C on the second midterm), I got one of the highest scores once we moved onto Taylor series and related things, with the class average dropping from a typical ~70 down to a ~40. Not that I see myself as remotely strong in math overall, but it did make me feel good that there was some area that I didn't suck at.
Weak points, in addition to most calculus, were (unsurprisingly) in physics and physical chemistry II. I also got Bs in virology and immunology, but that was because I hated the way they were taught and didn't study for them except for the (always easy and cumulative) finals. The ~15% of extra credit (in the form of bake sales and blood drives) on our total grade helped too.