19 hours in summer semester

Im currently a junior in college, and im pretty behind, so I am trying to catch up. Im taking 19 hours in an 8 week period.

I will be taking-

O chem 1

O chem 2

Quantitative analysis

Cancer Biology

Intro to biotechnology

cell and molecular biology

Does anyone have any tips to survive the semester? I also have rent to pay and need to find a night job. Thanks all.