Here are few preparation tips you can follow:

Go through & practise with previous year paper

Prepare a suitable time-table

Study and revision should be part of your syllabus

Focus on basic concepts

Make your own notes

Keep yourself updated with current affairs

Read News Papers

Focus on your personality and communication skills: Interview is one of the most important parts of the examination. It is vital for you to convey your thoughts clearly to the interviewers. Hence, concentrate on polishing your communication skills and body language.

Good Luck!