I've got 8.5 GPA in 10th, 79% in intermediate, 56% in B.Tech, which entrance test I can prefer?

For CAT Data Interpretation preparation, candidates can refer to Arun Sharma's books for CAT DILR. His books cover this topic comprehensively.

Yes, Data Interpretation is important for CAT as it makes up for 50 percent of the DILR sections, which carries a weightage of 66 marks.

There are usually 8-10 questions on Data Interpretation in CAT. The questions are in sets of 4 or 5.

Practise previous-year CAT questions, mock tests, and vocabulary books such as Word Power Made Easy. Reading editorials and quality articles can also help.

Yes. It improves grammar, vocabulary, context-based understanding, and sentence interpretation, which are useful for VARC preparation.