A have problems in school, i study but instead of upgrading my grades y get worst, what should i do?

Answers:
You need to review your method of study. To score a better grade, you need to understand a subject.
Then do some summary on every topics.
When the exam is nearby, you need to choose some more important topics and concentrate on these topics.
As you have understand all the topics, you will not worry even if some of the important topics did not appear in the exam papers.