As per your question in all documents you have Kumar as a middle name where as in your 10th marksheet it Ankit. See this kind of issues can create a problem during your verification, but if you want to avoid such instances then I would recommend you to go to your nearest DM's office/Education Officer office in your district and get the problem discussed then can provide you some certificate of bonafide which can be helpful. Also you can visit your school and ask if there are some provisions through which any certfication can be provided by the school or for the correction of the marksheet if its possible then also you can correct it.

To know more about DU LLB entrance visit the link below:

https://law.careers360.com/articles/du-llb

I hope this answer helps. All the very best for your future endeavors!