sketches....

Just finished with my bio. and microbio. midterms. Doing some 

random sketches and realize that not being able to draw for 2  months

because of the start of school has a huge impact on my drawing skills.

It also makes me extra grumpy as if everyday is freaking raining(not that it isn't).

Why is it that I just concentrate better in bio class when I have something to draw on hand? memorization by association?