Hii Ayaz!! NEET ptovides guidelines for dress codes to write the exam every year because many students do cheat taking advantage of the clothes by hiding any impermissible gadgets or chits. You need to adhere to the guidelines or else you can not be allowed to write the paper. According to the guidelines, you can't wear long tops and kurta comes under the same. A simple tee and Lower will work. Although you can also talk to the authorities of your exam centre and they will tackle the case. Hope this helped, thank you. Good luck!!