Need Your Help

Hi again.

Okay, so, I want your help.
Are there any sites wherein I can get the complete description of physics, chemistry and mathematics separately.
Wherein the language in which every topic is explained is easy.
And wherein I can get each and every topic's information in detail.
If you have any idea about any such sites then do let me know about it.
I really do need help.

I know, it sounds crazy posting such an article in such a site where the whole thing is about stories, poetry and other things but hey, buzzle is intelligent life on web.
Isn't it?

You see, I haven't got good grades in my previous tests and me as well as my parents are bit annoyed and tensed now. Let me tell ya all, when I said "no good grades", I really meant "NO GOOD GRADES."
Have got no true friend to support me that's why turned to you guys for help.
So, if you guys can help me out, I will be really grateful to you.

With regards,