I am 12 appearing student & I want to join a coaching institute in kota which is best for me 1,Resonance,2,Allen career coaching,

here i guess that u want engineering coaching.(If its for medical, go to allen without 2nd thoughts.) Join any institute.it doesn't matter much. All institutes provide same study material and good faculty...just beware of private teachers and other small scale institutes.they are nothing but frauds.