Another thing I'll add is if you want to do it yourself it may be useful if you've been in any situation where you had to learn how self study before (i.e. uni).
I did BAK/PPL when i was 15-16 and I found it pretty difficult to learn just by reading the book because I had always been taught by a teacher up until that point. It wasn't until about my 4th CPL subject that I actually got the hang of it. I did the ATPLs after I'd done a few years of uni and it was much easier than PPL level stuff for me.
So if you've done that sort of thing before it may be easier to get it done solo, if you're straight out of high school a course may be the way to go.
The thing I found most useful was practice exams. Generally the more I did, the better I went in the subject. They really help you focus on the bits you are a bit weak on.