Why did Jacob drop out of school?

Well, most of Eclipse took place over the summer.

As for Breaking Dawn, I have no idea, I didn't really pay attention, but I guess there was no mention of school, and he was always doing other things.

It diddnt dirently say that he dropped out , but we can just assume that if he did, then if আপনি were in his case , আপনি would too.
When আপনি transform into a অতিপ্রাকৃতিক creature with the circumstances of a vampire returning to hurt the ones আপনি প্রণয় then maybe school would not be your শীর্ষ priority.
And also what cassie said, summer holidays and all that tiome inbetween.