I forgot all about math!
Don't panic, it's normal that high school is different from junior high school and primary school. It is rich in content and systematic in knowledge. If you don't study systematically at ordinary times, it is easy to forget what you have learned. Otherwise, if you don't review in time, you may forget. Obviously, without systematic study, it is more difficult to recall future knowledge. You should learn to summarize and systematize what you have learned.