How can you concentrate better?

I have some problems concentrating. It really annoys me a lot. When I have to study for something, I can read something again and again and I can’t remember what I just read. If there is the slightest sound in the background, I can’t read. I am a major lover of literature, but I am not reading as much as I’d like to because of my problems with concentration.

I just wanted to know if anyone has any tips on how to concentrate better?