I m studying now in 12^th . Next year I will be giving my NEET exam . My 11^th syllabus are not strong and 12^th are just 80 % strong that too only for 5 chapters in each subject ( PCB) . So , is this 8 – 9 months enough for cracking if I work hard ?? …....

Please suggest me sometips to do in these 8 months .

dear student 
time are very less for you now . so, start doing hard work . 10 hours of study per day . 
and practice at least 200 ques fdrom each chapter , that too only for imp chapter beacuse u will loose in board by doing that . 
give board your first preference . 
and do prev year paper , scoring in biology will e easy in neet , so, give bio max time and try 300-310 in that . 
rest chemi 100 and physics 80-90 will give u above 500 and u can easily fetch a govt college . 

HOPE IT CLEARS 
kindly approve