Hello Aspirant,

No you cannot join the seat allotted in round 1st if you get a seat in round 2nd.

See if you got allotted a college in round 1st then you can either join it or leave it, if you join it then either you can apply for upgradation or you take admission in that college, in case you apply for upgradation and if an upgraded seat gets allotted to you in round 2nd then the seat allotted to you in round 1st will automatically be cancelled and would be allotted to another candidate, So you cannot take it back if you got an upgraded seat in round 2nd but if you don't get an upgraded seat in round 2nd then you would retain back the seat allotted in round 1st.

For more details on this topic you can check out the information brochure issued by MCC, from the link given below :-

https://mcc.nic.in/WebinfoUG/File/ViewFile?FileId=4527&LangId=P

To have a list of all those colleges which you can get based upon your marks, category, and state you can use NEET College Predictor because it will make you comfortable while choice filling in counselling :-

https://medicine.careers360.com/neet-college-predictor?icn=QnA&ici=qna_answer

If you want to prepare further for NEET 2022 then to help you in your preparation we have some resources which you can access from the link given below :-

https://learn.careers360.com/knockout-neet-may

I hope this information helps you.

Good Luck!!