Dear Somenath, the end of your preparation chart for these entrances exams comes with giving tests and previous year papers.
The test series comes up with all what you need at the end. These shows you level of preparation for the exam and helps to build your concepts.
Talking about the most popular test series, many students go with ALLEN TEST SERIES which costs between Rs. 3000 - Rs 4000. This test series has significantly received positive reviews.
Then comes AIATS (ALL INDIA AKASH TEST SERIES). The cost of this is same as that for the former one.

These two are the most popular ones. You can also go for other test series like Target PMT, Sri Chaitanya Narayana, Fountain, Narayana etc.
But their costs is more than those two.
Note:- Try to complete your syllabus then join test series as it would be difficult to manage both.

Feel free to ask for any query.
Hope this helps :)

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