Hi,

For preparing for Mathematics in RRB JE, here are some tips:

1. Memorize the formulas after understanding what they mean. Practice them on a regular basis.
2. Practice a sufficient number of questions for every topic. This will help you improve your application skills, problem-solving abilities, and speed
3. While solving the practice questions or taking the mock tests, analyze your weaker areas and work on them. This way you will be aware of your stronger areas too.
4. Invest at least 2.30 hours for mathematics regularly.

Also, google some best books required for the preparation.

Good luck.