whether we have to write entrance exam to join colleges in other states (i live in tamilnadu)

hello dhanush,..

there are many entrance examinations for various college admissions, as you may know that the jee examination is an all india level examination which lets you qualified for colleges all over india, If you could qualify and score good percentile in that joint entrance examination for bachelor of technology and other entrance examinations like neet for medical entrance examinations, icar for agricultural related courses providing olleges etc. there are also many other examinations conducted by respective regional education authorities of their states which qualifiess you to colleges controlled and funded by government or other concerned authorities conducting the respective examinations for their colleges.

hope this information was useful to you...

all the best for your bright future..