hmmm...doesnt matter if u cudnt perform well in JEE-08.... ofcourse u can do he nxt yr... boards nd school will nt be thr to bothr u.... but but but....u urself has to be well determined, nd focussed all thruout the year....u shud have just one thing in ur mind...that if u r dropping a yr, u wont leave any stone unturned, to get into the most premier insti of the country which ppl call 'IITs' as prakhar said, evry studnt starts with a gr8 enthu... but aftr some months...saturation comes...u wont feel like studying.... wenevr u'll open the buks..u'll feel as if u knw evrything... but NO... this all will negatively effect ur preps...plus thr r chances thr will be frustation(its quite obvious)....so if u r ready to face all this..nd still determined enuf to give ur best shot... do give it!!!

as for self study v/s coaching... i personally rate self study bettr... cuz u urself knws ur plus minus points the best.... coaching teachrs can give u support, can clear ur concpts, can solve ur doubts.... but they wont ever write ur xam paper.... if u think u hav means for all this...thn study on ur own.... nd for doubts...we  r always here

gud luck