Hello Aspirant! Your choice filling order in JOSAA should be according to your priority. Like the college that you want the most should be on the top and which you want after all the others should be placed at last. You can place all the top NIT's and IIIT's with their higher branches on the top and then your home state NIT that is NIT Jamshedpur with it's respective branch, which you want and other lower NIT's and IIIT's with their lower branch at last. You should place your home state IIIT that is IIIT Ranchi at last as it's reputation and placement is not that good as compared to others. Also, place BIT Mesra after NIT Jamshedpur as it's better than other GFTI's. That should be your order that is according to your priority and the reputation of that college.
Hope this helps.