Mains is the phase where fate is decided but if you are determined enough and hardworking as well, you can compete with other candidates. Why only few candidates crack the exam, because they know where they need to work more, for which subject they have to practice more. So make your study plans according that and do more and more practice. Attend mocks, and if you think you need to go through the concepts again, just revise all the important methods or concepts.