The following resources may be useful if you are searching by topic for Further Maths:
AQA Topic Tests for Maths and Further Maths
From Physics and Maths Tutor – see Maths Revision which includes GCSE, Maths, Further Maths and Internation legacy questions by topic.
From ALevelMathsRevision.com Further Maths Exam questions by topic. The questions are legacy questions but are chosen for relevance to the new specification.