What are the sources for questions provided in topic test ? Does it contains CAT questions in mocks ? At this time what will you suggest, whether to solve particular topic test or solving Past CAT papers ???

Hi Deepak,
In study room package, we have a large database of 5000 questions, which include self-made questions as well as previous CAT questions. In mocks, we do not give the questions from previous CAT papers. Questions given in mocks are self-made. We make sure that the questions are as close to CAT level as possible.
If you have certain weak areas, we would suggest you to take topic tests rather than moving on the previous CAT papers, but if you believe you have a good foundation in all the topics, you can move on to solving previous CAT papers.