Copious amounts of summer homework ok for mental health?

I'm currently a junior in hs, and not meaning to brag, one of the better students. Last year for the first time I was given summer hw in 2 cles. This included: read 6 books, read 200 pages and take 8 pages of notes, write 8 essays, write 15 1-page responses using primary doents to historical question plus a few other ignments. Although I tried to spread it out over the summer, I spent the last 3 weeks of my summer holed up in my room working around the clock to finish. I didn't see any friends and missed a weekend trip my family took. I have never worked harder or been more depressed in my life. This summer, the work seems to have doubled. Teachers argue that its to prepare you for the workload of the cl and give you a headstart, but the cles were much easier than the work and about only 10% pertained to curriculum. I argue that this level of work is bad for students as I was about to snap and summer should be a time to relax. Is this amount of work ok for mental health?