Here are some important materials for aptitude.

1. QUANTAM CAT-Sarvesh verma
2. QUANTITATIVE APTITUDE-Arun sharma
3. Past year question papers of CAT.
4. SIMCATs,AIMCATs.

There is nothing that could substitute hard work and aptitude is all about hard work. Start with some basic questions and the topics you are familiar with. Nothing is tough, your perspective makes it tough. In aptitude, the books I have mentioned are very good. Start preparing by them and I am quite sure that you would find very changes in coming months.

FOR INFORMATION VISIT THIS SITE https://bschool.careers360.com/articles/cat-preparation-2019-how-prepare-for-cat-without-coaching

GO GREEN, PLANT TREE