how many consecutive year we can give 12^th improvement.if we take adm inn any eng clg or nit cn we get admission in iit next year by giving jee adv

@ stiti 
yes , u can, i have many examples of that . 
but in that case your 1 year will be went in waste , and the valuye of that 1 year will matter a lot in your life . 
and u can give board improvement un limited no of times but no value of doing that , u can give mains only 3 times . 
HOPE IT CLEARS NOW