You can hardly get into NIT Arunachal Pradesh in biotechnology engineering, NIT Srinagar in Mechanical Engineering, or NIT Nagaland in Civil Engineering if you do not belong to the general category.
If these aren't your dream colleges then you must listen to my friend’s experience.
It is suggested that a drop year could prove to be beneficial for you, as it helped my friend too. Study hard for a year and give your best shot. You will definitely score a better rank.