For that you need to clear you JEE mains and advanced and that costs you a lot efforts and thus you need to finish your syllabus of class 11th and 12th with tricky and quality questions and prepare yourself to study with a schedule and strengthen your numericals solving power. 

Hi Servesh,

IIT Bombay is one of the best engineering college in India. To get admission in IIT Bombay, you'll have to qualify JEE Main and then JEE Advanced. Since IIT Bombay CSE is the most preferred branch by the students its cutoff is really high.

If you're from general category your rank in JEE Advanced should be less than 60.You'll find the detailed cutoff for all categories in the link below:

https://engineering.careers360.com/articles/jee-advanced-cutoff-for-iit-bombay

All the best