should i get regrade(remark)??

as title,do you all think that i should get regrade for my physic?? choice must be made really fast...
if i get regrade, i need to pay RM 50 for it and got 50% pass and 50% fail, because i am not sure that i did very well in the exam... Now, this is what i am thinking, should i waste RM 50 for regrade for a subject that i not sure whether i can pass it or not. Even if i get pass from the regrade, i just can get C grade for my physic. If i dint use the RM 50 to regrade, i can use it to do many other thing, such as pay my rental, buy daily uses, buy food and many more... Hmmmm...really annoying lah... How good if i can get it all pass?? haiz...just can blame that i am not hardworking enough!!