i have dropped an year for iit jee as i didnt clear individual cut off for physics (it was 13 ..i got 11)but as for overall cut off ..it was cleared pretty good.ihave allen distance learning package now...is there anything other than this required??

@asish 
i think u will give the jee again in 2017 , if so, then allen distance learning package are sufficient for jee mains only , and not for jee advanced . 
for jee advanced u need to study h c verma also , even i studied that allen package , but its nt sufficient for advanced . so, extra , just read h c verma physics , 
and in organic , only for tips and tricks , look on o.p tandon . 
and rest are enough for jee . 
AND KEEP PRACTICING THEIR DPP TOO , THEY ARE ATMOST IMPORTANT . 
AND TEST SERIES ALSO , 
ALL THE BEST ..
 

I feel dropping an year is not a good idea. What if you don't get good marks or even this much of marks next year. Better would be go for admission this year only. If you are not able to get admission in a good govt.institute with these marks, these marks can get you good private universities.
These days even private universities are imparting quality education to the students around the world. They offer you admission on JEE scores/ tests conducted by them/ your marks in 12th. Some of these also offer good scholarships based on any one of the above mentioned admission criteria.
Lovely Professional University
Sharda University - School of Engineering and Technology
Chitkara University