JEE mains is an entrance exam for admission to engineering courses in India to top institutions.

Can you read so have completed there plus two course with physics chemistry and mathematics as subjects are eligible for applying.

For SC category the cut of percentile is 48. And you are qualified. Since you have 98.88 there are chances for you to get into top institute for CSE in your cater green quota or homestate quota.Safe percentile for qualifying jee main is 85 for general and for sc it may be around 80 percentile.

With your score you can definitely get into NIT. Here are the list of Engineering Colleges accepting JEE mains in India

https://engineering.careers360.com/colleges/list-of-engineering-colleges-in-india-accepting-jee-main you can use the college predictor given below for knowing your college