As you progress throughout the school years, the work, effort, and determination needed are only going to get more challenging- but there are plenty of pay-offs as well. As you enter highschool, some aspects may feel more demanding than others, and there will certainly be times where the work will make you think. I cannot speak for every freshman, because my schooling may be quite different than yours, and every school and curriculum is different. If you want to prepare to do your best in this coming semester, my advice would be to attempt to find the importance in what you're being taught. Do the homework, try to make an effort, and try to enjoy yourself if you can. Depending on your school, certain parts of the work/classes may become more strict, but if you show that you're dedicated and a hard-worker, things will go more smoothly for you.
You don't have to be afraid of school, although it is completely understandable. Highschool can be a big step, and it may look pretty intimidating at times, but as long as you put your best foot forward into everything you do, you will be just fine. You don't have to like all of your classes- yet you may find that you even enjoy a few. Whether you particularly enjoy a class, subject, or not, school is to help you prepare to tackle anything that's thrown your way, as far as educational situations go. You'll do just fine, Thrillex. <3