I want able to understand LRDI since I have completed my BBA but doesn't have a good Catch up in LRDI please give some suggestions

You should start off with solved examples from books like Arun sharma or TIME coaching material and understand the approach of solvibg, try to solve similar questions where you find you're weak at with such solutions. Revise the mistakes you frequently conduct and analyse the time you consume for the same by giving mock exams online from TestFunda, Oliveboard, HitbullsEye. Best tip for LDDi is visualize the problem and understand by making it simpler through diagrams. Solve different varieties from above mentioned books and understand the approach for the same.

For LRDI section the most important thing you need to do is to figure out the pattern of working through them. Every question is unique in its way and you need to start working your mind to figure out how to approach the question before you can actually start solving it.

For this best way is to go through the last year papers and different books for quant where these types of questions are mentioned. You need to make sure that before seeing the solution you attempt the question with your best efforts and then you can see the solution. This will help you in comparing your approach to the solution with the best approach.

In LRDI to figure out the approach to solve a question is very very important so think and practice a lot till the time you hit with the correct tune of best approach.

Think and Practice is the main stretch to get well in this section.

Above all this you should go through previous years questions and get an idea of pattern and level of questions been asked in previous CAT papers.

Different types of DI Sets:

Tables & its variants
Bar Chart
Line Graphs
Pie Charts
Venn Diagram
Miscellaneous data types  Spider, Triangle, Scatter Diagram

Different types of LR Sets:

Arrangements (Linear and Circular)
Tournament & Games
Sequencing & Ranking
Selection
Networks & Routes
Cubes & Venn Diagrams
Puzzles
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.

Practice sectional mocks and analyse them to understand the concepts clearly.
All the best.