i am in ist puc and interested to do arch in iit.i understood the jee main process .but should we write the “2 papers”in jee advanced which includes maths phy and chem or aat paper in jee advanced ...if we pass in jee main ?

You need to focus on PCM and try to strengthen these three...go for extensive practice...join some renowned coaching center...download previous papers from internet and try solving …..enhance you speed of answering maximum answers in lesser time...and if you follow all these guidelines, you’ll definitely be able to make it at any of the IITs and if not there then certainly at these enlisted ones – Lovely Professional Uni, Phagwara,......Vedvyasa Inst of Tech, Malappuram,.........N C College of Engg, Israna          …...So, Wish you good luck