When during graduation should a person start preparing for CAT GMAT or any MBA entrance exam?

You can refer How to Prepare for Logical Reasoning for the CAT by Arun Sharma and Logical Reasoning and Data Interpretation for the CAT by Nishit K Sinha.

Although syllogism rarely appears in CAT exam, you must not skip it thinking it is not important. Every topic included in CAT syllabus is important.

In the past few years, hardly any direct question has been asked from Syllogism. However, since it is a part of Logical Reasoning, candidates can expect 3-4 set-based questions.

TANCET is enough for most Tamil Nadu MBA colleges, including many government and private options. But if your dream is IIM Trichy or the DoMS at IIT Madras, you will need a strong CAT score instead. So the real answer depends on which college you are aiming for. For a solid mid-range MBA college wit

CAT coaching institutes in Bhubaneswar that offer weekend batches are Career Launcher (CL), TIME, iQuanta, SuperGrads and Milan Learning Resources Management.