Hii

It is difficult to say what is the exact marks that would be required as the cutoffs for all the colleges are different and it varies every years depending on factors like no. of students, difficulty of paper, etc. The competition is very high in NEET as there are less seats and a lot of students competing for those seats. So it is suggested to keep a higher target to secure a seat without donations.
As per the previous year trends and cutoff, scoring around 560-600 and above will be a safe score.
If you could tell me some particular state or even college that you wish to go to, i can provide you the previous year cutoffs of that college.
Here are the last year cutoffs of top colleges-

• MAMC Delhi - Rank 1 - 38
• BMCRI Banglore - Rank 4- 779
• GMC kottayam - Rank 19- 621
• IMS BHU varanasi - Rank 43 - 187
• Lady Harding - Rank 45- 141

Hope this helps
Thanks!!