first of all...choose a gud coaching,,and leave schools(biggest reasonz for getting distracted!)
next start waking up morning at 5:30,,coz at dis stage,ur mind acquires super-learning mode..hence u memorise things faster,,,
do maths rigourously...prior attemps shud b given to basic books and den advance levels lik A.das gupta,,sk goyal....loney's resnick halliday's ...irodov.....etc..etc..
give more stress for learning concepts...and little practical in ur approach.
organise ur self....make time-table for regularity....
practice meditation...coz dat increases ur concentration and overall brain-power..!
time management is very important factor in JEE....so improve ur cognitive skills by doing more and more practice diligently..
thats the most precise pathway for ur success in joint entrance exm!