To score more than 90% with studying between gets of different papers is possible if you follow a proper strategy. The pattern of the exam remain same almost all the questions gets repeated in some way or other and if you are able to pick those questions then you will be able to score better in the exam.while you preparing just locate the previous years papers and find out the important questions and prepare the questions very well and questions related to them because it will lead to a good understanding of the important questions and also prepare how to write the answers for those questions.if you are able to grasp concepts within short span of time then it is advisable because some conceptual questions will also come.

If you follow about strategy then it is possible to secure more than 90%.