Well my study score for further maths wasn't the greatest, however I do know quite a bit about the further maths course.
I was however averaging about 98-100% in year 11 (general maths). Last year I wasn't doing that much study for further maths, however I did do about 25 practice exams... My advice would be to not do that many practice exams 10 should be enough, instead what you should do is start your notebook early and take note of all the mistakes you make, then when you come to exam preparation you will be able to know how to fix those mistakes, and you can use your practice exams to prove whether or not your method of eliminating your mistakes works... thats just what i think. As for a tutor I would probably say that you don't really need one, you can pretty much teach yourself the concepts covered in the subject (if you need help you could always post a question on here), however if you find that you're constantly struggling then maybe you should get a tutor.
Good luck with further maths =)
Hope that helps