Can you suggest some institutes in Jaipur for doing a crash course in CLAT?

To improve CLAT logical reasoning, candidates must start by reading editorial articles daily to identify premises and conclusions, and practice passage-based questions under strict time constraints.

Although there a lot of books, a couple of recommended options are shared here - 

• A Modern Approach to Verbal & Non-Verbal Reasoning by R.S. Aggarwal 
• MK Pandey's Analytical Reasoning

As early as possible as this will give candidates ample time to build reading speed and critical thinking skills to solve the questions with ease.

No, it is not that easy since it comprises 20% of total marks, skipping it makes clearing overall cut-off impossible.

Neither online coaching nor classroom coaching is better than the other; in any case, it all depends on your discipline and timing. Online coaching will save you time from travelling through Lucknow, whereas classroom coaching gives you discipline and instant solutions to your doubts.