Below are the following things that you need to follow to ace in chemistry:
1. Firstly, understand the concepts and make a note of it.
2. Highlight all the important points and formula.
3. Practice as many questions as you can.
4. While revising, don't start reading from the first page of your textbook. Rather, go through the notes that you have made.
5. Make sure you know what are you good at - organic or inorganic chemistry. If you are not good at organic chemistry then try to understand the basics first and make inorganic chemistry stronger.