accepted here and planning to attend soon
I have only attended De Anza during three of its summer quarters, but from what I have experienced, it is always a good idea to spend at least one hour of concentrated studying for each class you take. A good place to study is the library, since there are quiet study zones which allow you to focus and concentrate on your studies. Also, try not to skip lectures, because some professors will tell you important things you need to know for your exams or important dates. If you have not registered for classes yet, be sure to leave spaces in between your classes; you might need a break after attending a class (i.e. a two-hour long class).