As I've mentioned before, I wasn't exactly the most outgoing or interesting person in the class back in high school (equivalent). I didn't stand out at all, and I didn't really make much effort to do so. This wasn't to say that I was completely apathetic of my lack of presence, since I wanted to be Unique and Known and Popular, but I think that made me even more normal, since every teenager, sooner or later and for varying periods of time, wanted the same. In any case, I think I was already aware, back then, of how futile it would be to try to stand out in a positive way, to have an Interesting School Life.
Maybe if I had chosen a different seat, though, the fates would have aligned and I'd have discovered a secret book hidden in the deepest recesses of the library (gods knew I spent more than enough time in there; the librarian specifically informed me that over the course of a year, I borrowed over eight hundred books, albeit some of them repeats) with easy-to-understand step-by-step instructions on how to WIELD ZE POWAH OF MAGIC or something. How To Fire Eye-Beams For Dummies, maybe.
Research into various school days anime seems to show an intriguing correlation between seating position in class and the probability of Main Character status. Now, note that it appears to only increase the probability, rather than turn it into a certainty, and it seems to affect only Main Character status, rather than Side Character. It helps if you're seated near the Main Character in order to achieve Significant Side Character rank, if only due to increased proximity, but this is not always a given.
So, which is the best seat to choose if one wishes to have a greater chance at an Interesting School Life?