Hey.

First of all you should try to improve your General Knowledge, read the newspaper everyday. Don't just rely on the current affairs modules available in markets, try to develop a habit of reading the newspaper.  As English Language skills is also a part of the syllabus you should go through the Editorial section of the newspaper for improving your vocabulary. As far as critical and creative thinking is concerned, you need to think on the spot for that as you cannot predict the questions in this section. You should go through the sample papers and previous year papers to know rhe type of questions asked previously. You  should know how to present your answer logically.

Best of luck