hi, language preference will never affect the 15 percent quota or any criteria,Candidates from the states of Andhra Pradesh, Telangana and J&K are not eligible for 15% All India quota seats as these three states had opted out of All India scheme since its inception. If candidates claim the eligibility under this criterion, they must submit a Self Declaration form online. Candidates are suggested to take a print out of the form as they may be required to present it during counselling. Hope this helps, good luck

Hello Sumit

The choice of medium of language in NEET entrance exam has no bearing on the eligibility for All India Quota admissions. Irrespective of the medium of language in which you give the exam, you will be eligible for All India Quota and other applicable quotas under the State Governments/Institutes, provided you fulfill other eligibility criteria with regards to age, marks in qualifying examination, minimum required percentile, etc.

I hope it answers your query. In case of any follow up questions, feel free to ask.
All the Best!