Hello,

 The exact number of students who have scored more than 300 marks in NEET 2019 from Tamil Nadu is difficult to count. You can know the number of students qualified in NEET UG 2019 in an All India count. If you want to know your chances of admission in Tamil Nadu colleges then you should refer the last year's cut off marks as this is a reliable way of estimating your chances of admission instead of keeping record of the number of students scoring 300+ in NEET..

For more details about the cut off for 2018 in Tamil Nadu, Click on the following link

https://www.google.com/amp/s/medicine.careers360.com/articles/neet-cutoff-tamil-nadu/amp

Good Luck.