I am getting around 100 marks every week in jee mains mock test. But my aim is 130. how can I achieve this in 20 days.

Dear student,
To increase your marks in mock tests and eventually in the examination you need to assess your performance first. After attempting the mock test, assess the paper and figure out where you kade mistakes so that you do not repeat them again. Then look at the questions that you were unable to solve. Practice those questions nicely. Then solve more and more previous years question papers to increase your confidence and practice the most frequently asked topics really well. You will observe a gradual betterment in your performance after doing these things.