Writing this answer anonymously because I dont want my friends to call me a Ghot(slang for one who studies too much).
But I am the one who is doing what you are asking in the question, it’s simple- be the best among the best.
In other words a CG above 9.9 is what you need to avail institute merit Scholarship of 80% of tuition fees if your parents income is above 8 lakhs.
If your parents income is below 8 lakh, then you can avail MCN in which you’ll require a CG above 8.6 to avail 80% scholarship.
Your fees for 4 years would be around 8–9 lakhs including hostel and mess fees.