With an SC preparatory rank of 151 , gaining admission into IIT Delhi or other top IITs for the CSE (Computer Science Engineering) branch can be quite competitive. Generally, IITs have a limited number of seats available for preparatory courses, and the cutoff ranks vary each year based on the number of applicants and their performance.

While your rank places you in a good position to be considered for a preparatory course, the final decision depends on several factors, including:

1. Number of Seats Available : Each IIT has a specific number of seats allocated for the preparatory course, especially in popular branches like CSE.
   
   

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2. Previous Year Cutoffs : Look at last year's cutoff ranks for the preparatory courses in IITs to get an idea of your chances.
   
   

3. Counseling Process : Attend the counseling sessions and express your interest in top IITs.

If you do get into a preparatory course, successfully completing it can lead to a seat in the CSE branch for the following year. Stay hopeful and actively participate in the admission process!