The broad topics are

• Real Analysis
• Linear Algebra
• Probability 
• Statistics

1. Start solving your past year's paper.
2. Make a Separate Copy.
3. Try to figure out what you can solve and what you cannot.
4. Take this feedback and try to work on your weak areas.
5. Take some guidance from some expert like seniors, teachers, etc ( Not Necessary )
6. Repeat.

All the best!