The approach should be as under:
Step-1: Take a mock. Analyse it. Solve the questions that you missed out on during the test and that you solved incorrectly, without looking at the solutions to make sure that you understood the analysis completely.
Step-2: Repeat for another 2 mocks.
Step-3: After taking 3 mocks, identify your weaknesses and work on them.
Step-4: If the weakness is in a particular section, solve sectional tests. Make sure you solve sectional tests and follow them up with rigorous analysis until you get confidence in that section.
Step-5: If the weakness lies with a particular topic, go back to the books, revise the topic, solve the sample solved questions, the exercise that follows. These many questions should bring the confidence in the topic.
Step-6: Once the above steps are done, move back to the mocks. Take another 3 mocks and analyze them. Then repeat steps 4 & 5.
Once you are comfortable with all the sections, take as many mocks as you can to improve on your confidence. After around 12-15 mocks, the time taken for steps 4 & 5 should reduce exponentially. If it doesn’t you are having issues with the concepts. Do talk to other people in that case for help.