It depends on your objective. If you want to get ahead because you really want to just focus on learning the material, meaning you want to truly understand it, then by all means go for it. If you only want to get ahead to gain an edge over your equally competitive classmates, then I say no.
Either way, you're going to forget a lot of what you read anyway, meaning that you'll have to re-read the stuff. Consequently, you won't be gaining any edge whatsoever. Just relax during this long break. Sometimes the best way to gain the upperhand is by resting, so do so: you'll thank yourself later.