u prepare about any subject with so much hard work and u get numbers less than the paper for which u put less efforts?this happens in exams frequently..it means results r not directly dependent on your efforts only...any event happens due to combination of many events...u pass in exam...exam day ur pen was working,ur mind was right,u could reach safely at exam hall,your bike was right,u were knowing the answers of questions...so on..and all these add up to make u pass..failure of even a single event will fail u...all r important...and out of these events many events r not depending on u...u cant do anything about it...they happen... ...that is why things depends on ur hard work,your luck and god's grace all three...and not on a single one..