How do I know everything?

Computer Science major here,
It seems like everyone in my class knows everything already,
And they quickly absorb all new information.

How do I become like this?

...i think what your looking for is called under-pinning knowledge

eg, you don't do algebra before you can add and subtract...

...Go learn as much simple stuff as you can // or start with the complicated bit and 'Take it to pieces'.... until it is Simple =)