Intelligence and being educated-question

No.12091700 ViewReplyOriginalReport
I recently abandoned my shitty low quality entertainment and got really insecure about intelligence and such. In order to cope I wanted to get more into science and knowledge and all that. In school I usually had good results without much effort so I believe I am of high-average intelligence. Could any of you give my any good sources of not hard to understand without prior knowledge subjects in the area of mathematics, physics and other things to help me get sophisticated and educated? I am still in high school so my other question is: Is high school designed for the average person to succeed at every subject with just hard work, or is it rather hard and its expected to focus on one subject one is talented at?