I'm reading the to aru majutsu no Index Llight novels on baka tsuki, and i'm kinda getting bored of reading the novels that were covered by the animes.
so my question is, can i skip the novels 8-13 to get to ww3 without missing anything?
its actually volume 11 that I've just finished
You should read the angel fall arc, but other than that, yes. You can skip everything to the C-Document arc. That arc is boring and not tremendously important and bored the shit outta me, so you could probably skip that one too and jump to Battle Royale.
in my opinion yes, but read the novel 13 because the anime skip information and censure the accelerator parts
Anime did a decent job adapting 12, but it rushed through 13, and skipped an entire chapter of SS1.
You only have three more volumes till you are in new content, so I'd just sludge through them personally.