New Zealand - My dilemma

Im going to New Zealand soon for working holiday. But i havent bought the ticket yet. Actually im in a dilemma right now whether i should depart on March or May. The reason i'm delaying my departure is because i want to attend MARA examination for postgraduate scholarship. However, the competition is very high, thousands of applicants will be competing hence its difficult to get the scholarship. Actually its a win-loss situation, if i end up failed the exams, i will have to depart to New Zealand on May and during that period of time, its pretty hard to get jobs. If i dont attend the exams, i would be able to depart earlier which is on March where there are plenty of seasonal jobs available. So? Making a decision is fucking tough isnt it?