IMO problems, can someone help me to learn problem solving skills?

I am a student and I want to enhance my problem-solving abilities of maths-problems.

I am Italian and I try to resolve the national problems (of course of my country) and I have some difficulty in solving them but I bought a maths-puzzles-book (Engel problem solving strategy) and I want to study it.

My question is can anyone who is able to solve IMO problems can teach my few things to reach my goal?

p.s.
For now I absolutely can not approach at the IMO problems, I have some difficulty to resolve the Italian national bracket problems.