Yes,you can wear lower or trackpants.

I think you are talking about your jee main or neet exam.yes you can wear it. Any simple and formal full pant you can wear.

Clothes should be simple, zip pockets, pockets, big buttons , elaborate embroidery etc should not be there in the clothes.

* Accessories  like wrist watch, belts, cap etc are not allowed

*   Any kind of ornaments like necklace, earrings, pendants nose pins , bracelet, rings etc is not allowed.

* Shoes or  boots etc are not allowed , you are   allowed to wear only sandals which are  open-toed or slippers