Being a high school student (and one very young for my grade at that), I've been having trouble finding any light resources (websites and other free things) concerning keigo and the degree of formality that ought to use. Most serious Japanese materials teach the formality that only adults are to use. This, of course, is understandable, 99.9% of Japanese independent students being adults, but it puts me in an interesting predicament.

For example, I came across the title 先輩 relatively recently, which, given my social situation, I really ought to have known, and of all things I learned it from an Anime rather than any of my textbooks or other materials. Similarly, any suggestions for formality guides for students younger than myself?

Any suggestions?

Thanks!

The genki textbooks give a good summary of keigo.

This might be what you're looking for. http://www.bk1.jp/product/02989316

I haven't used that particular book but I own the 四字熟語 book in that series and it's really great so I have high expectations for that one. It gives a short 1-2 page manga for each 四字熟語 depicting a situation in which you would use it. In the margins it has additional information like etymology and common mistakes people make. It's for elementary school students so the sentences tend to be pretty easy.