If you're moving schools you'll need to get ready for more work in the evenings. Here are some of the big differences.
You might have had 20 minutes reading to do each night and perhaps some homework at the weekend.
You'll get homework every night. There will normally be a homework timetable but teachers won't stick to it.
If you do fall behind letting your teacher know before the lesson is the best bet.
Ask for an extension, that means more time to do it.