Ah, it's not too bad, especially in the first year. For me, every time I enter a new school level, I'm always told it will be worlds harder, but...that's simply not true. At least not for me. There might be one or two classes that make you want to pull your hair out and write profanity on your teacher's car, but otherwise, it's a pretty chill time. Teachers tend to be awesome, the students are nice, and the general experience of it all is really great. As long as you manage your time well, it won't overwhelm you at all. I usually just dedicate one hour a night to studying and I'm good, maybe two hours during tests.
