Careerlauncher and Mbahitbullseye are some best sites for mock exams with solutions and mentoring to solve out your mistakes.
You can also go for Paid version of mock exams by TIME coaching which costs 2000 approximately for 20mock tests which would give you actual feel of CAT exam and you shall receive solutions set to iron out your mistakes.

Testfunda is one good site as well but lacks indepth difficult level problems.
The more you shall practice the more will be your confidence
All The best ahead..

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