It all depends. As long as you have taken grade 10 math first semester then grade 11 functions second semester, you should be fine. Disclaimer though that grade 11 is a big switch from grade ten as in where grade 9 and 10 math are closely related and then all of a sudden it is a new switch when you are introduced to functions. But to get to the point, it is a large jump as in new material but I found functions to be extremely easy. If you managed to get those marks for 9 and 10, it is safe to bet that you'll be just fine in functions.