Hello Aspirant,

It is not difficult to score 70 percentile in CAT examination. The past trend says that the difficulty level of questions asked in Quant is of moderate level. Quant requires enough practice of some basic concepts. The topics you can focus upon are:

Number System
Algebra
Geometry
P & C
Probability

Arun Sharma’s ‘How to prepare for Quantitative Ability for CAT will be of great help. Everyday practice for next one month will help you understand which questions are doable and which are not. Moreover, it will help you identify your strenghts and weaknesses. Another way that I can suggest is to give as many mock examinations as possible in these 40 days and carry out you performance analysis in detail.

You can also visit the below link for more details:
https://bschool.careers360.com/articles/how-prepare-for-cat-quantitative-ability

Good Luck.