Further maths

I am currently in y11 and I am considering choosing further maths/maths alongside computer science and physics for a levels. For anyone that has taken further maths is it worth it or should I stick to pure maths? Also how bad is the workload compared to pure maths, I assume it is more but wondering how much more; homework, class work and time I have to spend on further.

For reference I am predicted: 9 in maths, 77 in combined science, and 7 in computer science and my recent maths mock got me an 8 which is the grade I am required to get for the college I am hoping to go to.