Best sources to learn DILR for CAT? For math takshzila in youtube is the best

Yes its gud , just practice hard from arun sharma books.

Hi! You may refer to the following books for CAT DI & LR preparation:
1. How to prepare for Data Interpretation for the CAT by Arun Sharma (Tata McGraw Hill)
2. How to prepare for Logical Reasoning for the CAT by Arun Sharma (Tata McGraw Hill)
3. How to prepare for Data Interpretation & Logical Reasoning for CAT by Arun Sharma
4. Nishit Sinha's The Pearson Guide to Logical Reasoning and Data Interpretation
5. The Great Book of Puzzles & Teasers by George J Summers

Also read the article by Careers360:

www.bschool.careers360.com/articles/cat-how-prepare-for-di-lr

Yes. You can refer to Takszila.
For DI LR preparation:
Make sure you solve three to four DI and LR sets on an everyday.
Do not be afraid of solving complicated DI and LR sets.
You need to continuously challenge yourself and solve as many advanced level problems as possible.

The book for it you can refer to is Arun Sharma books and mostly recent editions. This shall help you.

All the best!