I see people have got level 2 or 3 mechanic. Can anyone help with that? idk what im supposed to do :p

Hi Darkstar, firstly...

You need to search for books in schools and libraries. Right click on them and search these and you will get the books you require. You then have to read these in order i.e. 1.1 and 1.2. Inbetween these you have to complete practical tasks i.e. bandage people, or take fuel tanks apart. This increases your skill progression and then you can read the next level book.

Hope this helps.