Prediction gone vain

"If u cannot understand other question its ok.Most important u must master the method to draw this graph..then a pass for ur test is assured.."This dialogue had been use by most of my coursemate who jz took the electromagnetic theory test just now...Empowered by their words, i tried my best and had mastered the method within 3 days (really takes a lot of effort and semangat to conquer this stuff)...Since there were still time b4 the test start, i tried to study the subject and went through the tutorials and managed to do all of them but jammed at 1 question..So, i decided to left it out 1st and decided that i WILL conduct a research on it next time..But, as time passed by,the question had faded away from my memory and i totally forget about the tutorial question that i had skipped few daes bak then..Finally,the test had approached and i entered the exam hall with infinity level of confidence since im well prepared...I took my seat and almost pengsan when i took a glimpse at my question paper..WTF..the tutorial question i skipped appeared in the test and the method i mastered,satu pun tak tanya..gg-ed....But luckily i was still able to answer most of them...dang..thx to that question i cant get my full mark...wahhhh..