How long should I study and how much should I go online?

how long should I study nad how much should I get on thr computer ?>I study about 4-3 hours ..is it enough ...

I think studying 3-4 hours straight is too much.
Because then you start to over think things a lot and it gets frustrating. Study for an hour, take a break, study for an hour, take another break. And just do it like that so your brain has the chance to absorb all of the information. Try different studying techniques too.