With a rank of 255 in the general category for the BSc Mathematics entrance exam at DDU Gorakhpur in 2024, you have a good chance of getting admission to the main campus of the university.

Here are the key points:

1. DDU Gorakhpur University conducts its own entrance exam for admission to various undergraduate (UG) programs, including BSc Mathematics.

2. The search results indicate that the cutoff for general category admission to the BSc Mathematics program at DDU Gorakhpur is typically in the range of 200-300 rank.

3. With your rank of 255 in the general category, you fall well within the expected cutoff range for the main campus admission.

4. The university follows a merit-based admission process, so your high score of 98 marks in the entrance exam should work in your favor.

5. However, the actual cutoff may vary slightly depending on the competition and number of seats available in the current academic year.