You haven't mentioned whether you belong to Rajasthan or Haryana. Neverthless, in both these States, Jat belongs to OBC. Now if you fall under OBC Non creamy layer, you will have to select OBC-NCL as your Category. But if your annual household income is more than the Non creamy layer slab, then you have to select General Category as your Category. If you fall under OBC-NCL, you will be eligible for OBC reservation of 27%.