Joining a coaching institute is beneficial as you would be exposed to a regular systematic study. Also, joining a peer group would make one more competitive. Online coaching classes/test series are beneficial too.
Thorough yourself with fundamentals of the core subjects. Update yourself with all current affairs and issues of general awareness.
Refer to the pattern and syllabus of the latest examination. Compare the previous years’ questions papers to identify repeated and important topics and questions.
A better approach is to refer to one book for a single topic, covering all the basics, instead of referring to multiple books for the same topic.
For technical topics, make short notes for important topics and a list of formulae to know for every subject. Make it a point to go through these notes and formulae on a regular basis.
Solve previous years’ question papers to assess your preparation level on a regular basis. Make sure to set a time limit when solving questions to prepare yourself to complete a task within the set time.
It is also advised to practice questions on OMR sheets to get yourself prepared for marking answers during the examination correctly and quickly.