It's understandable that you're curious about your chances of getting into the Computer Science Engineering (CSE) program at Madan Mohan Malaviya University of Technology (MMMUT) Gorakhpur with your JEE Main All India Rank of 311876 and an OBC category percentile of 78.99. Let's break it down in a simple way.

Generally, for popular branches like CSE in well-regarded government engineering colleges, the cutoff ranks tend to be quite high. Looking at the previous year's data for MMMUT Gorakhpur can give us some insights. In 2024, the closing ranks for the B.Tech in Computer Science and Engineering for the General All India category were significantly lower than your rank, typically falling somewhere in the range of 60,000 to 73,000 in the final rounds of counseling.

Now, since you belong to the OBC category, there is a separate set of cutoff ranks. While the OBC cutoffs are usually a bit higher than the general category, they are still generally much better than a rank of 311876. Based on the information available, the OBC category cutoffs for CSE at MMMUT Gorakhpur have also been considerably lower than your current rank in previous years.

With an All India Rank as high as 311876, even considering your OBC category, it's going to be very difficult to secure a seat in the Computer Science Engineering program at MMMUT Gorakhpur through the regular JEE Main counseling process (JoSAA/CSAB).

In conclusion, while admission to CSE at MMMUT Gorakhpur with your current rank is highly unlikely, especially through the All India quota, exploring the state quota (if applicable to you) and considering other engineering branches could present some possibilities. Keep an eye on the official counseling websites for the latest cutoff information. Good luck!