It's no use putting it bluntly. Take out those papers you took in the past and see what's wrong, whether you didn't understand them or whether you made a mistake.

If you don't understand, consolidate the corresponding knowledge in this field and do some similar topics.

If you understand, but do something wrong, it is carelessness, and being careful is also an ability. Don't be careless when you meet something within your power. Try to calm down and do it.

I believe you will make progress.

It's up to you whether to make up lessons or not. Children who can learn consciously don't need to make up lessons. But this is also my personal feeling. Make up lessons just to let you do more problems. You can do it if you want.

Last sentence, please accept it if you are satisfied.