Okay, so everything else you have done totals 40% of your grade? The way you calculate your grade is to find the weighted average for the course. That simply means multiplying each grade by its respective percentage, like this:
40% x 74 = 29.6
60% x ?? = ??.??
Add the two answers together and you get your final grade. If you get a 100, you'll add 60 points to your grade and end with an 89.6 . That is the best case scenario. The worst is getting a zero, which would leave you with 29.6 . Let's say you get that 60 you asked about. That would add 36 points to your grade for 65.6, which is rather low. If you manage a 70, it would 42 points, giving you a tolerable 71.6. A healthy 80 would add 48 for a total of 77.6, and a 90 would boost you by 54, to 83.6. That should give you some idea of your options. Don't settle! I bet with some effort you can manage a great grade on that final! Try using flashcards. I always did. Be careful to randomize them each time so you don't just learn them in order!