Dear aspirant

You have mentioned about AIIMS and du, so there is no any pre-registration before NEET exam or neet result for this two college.

Both AIIMS and du colleges seats are allotted through AIQ counseling which is conducted by MCC. Which registration only after the declaration of neet results. It is conducted in three rounds and if then also seats remain vacant them stray vaccancy round is conducted. As this year result have been out so registration and counselling date will be also declared soon. Keep checking the official website of MCC.

You can visit the link below for detailed information about AIIMS and DU counseling

https://www.google.com/amp/s/medicine.careers360.com/articles/neet-counselling/amp

You can use NEET UG college predictor tool for knowing chances of getting MBBS BDS ayush colleges at your expected marks.

https://medicine.careers360.com/neet-college-predictor?utm_source=qna&utm_medium=neet_cp

Hope this information helps you

All the best