Also important – as with everything in life – take it a bit at a time.
In 10th grade, we took 3 Regents exams – 2 in one day, 1 the next day. Yes, it was difficult – but boruch HaShem, we got through it. If you start thinking now about all the pressures, you’ll get too nervous.
If you’re at all able – try to review your notes from time to time, particularly notes from classes where the teacher doesn’t give many tests. That way, come midterm and final time, you’ll be a little more familiar with the material.
Good note-taking skills are important. Get advice, a book on the subject . . . If you find a teacher you like, maybe ask the teacher to give some points about note-taking. The whole class would benefit.
Get involved in school life – be a part of it. Be part of play, activities, etc. Beneficial in more than one way.
Hatzlocha.