Rajendra your percentile depends only on your scores. 22 Percentile means that your score is above 22% of students among all the students who have given MAT exam with you.

So, to increase your percentile you need to improve your score. There is no shortcut or any easy method. You need to work hard, improve your basics, work on your weakness, give lots of online mock tests, analyze them, make a strategy to give exam so that you can give your best in the exam then your scores will improve and so will be the percentile.

Percentile is totally a relative phenomenon which not only depends on your performance but also on other students performance so in order to maximize your result you need to have a high score. With 700+ score you can get a 90+ percentile.

All the best!!