Busy study

It's a very busy semester. 

I feel I need to study more and more!   Because I find I have a very weak basis in Computer science area,

In theory and programming practice.

Sometimes I feel energetic, sometimes I feel I don't want to study. How Can I improve my efficiency to implement my goal? - become very professional in computer science and my research area.

What's the quick way if there is not shortcut?

How to plan the study effectively and efficiently?

need to explore! gaga.....