Are you asking for Improvement Exam? Yes Improvement exam in one or more subjects students are eligible to apply for NEET Entrance exam but at the time of counselling you should have all the required documents. As per the eligibility you should have minimum 50% as a general category. You can check the further eliibility with the given below link.

https://medicine.careers360.com/articles/neet-eligibility-criteria

Good Luck!