Hi. The post is an old one, but I suppose a lot of students struggle to find a good topic and to get a high grade on Math IA. Here is some guidance you may find useful. There can be a lot of good ideas, but it very much depends on your preferences and strengths. But no matter what the topic is about and whether you are super good and interested in math or not, you can get at least a mark 6/7, if you follow certain guidelines, including but not limited to perfect presentation, clear formulae, exact structure, logical development of the ideas, personal approach to the work(i.e. the topic/problem might be a full repetition, but it should at least be presented using a personalized approach. But of course working out something yourself is the best and this is what secures the grade 7), etc. Always try to make the relevant graphs, diagrams, tables, other pictures, etc. by yourself and try to make the work your own. Present everything from your angle.
Also, check out a recent article/blog on tips for IB Math HL and SL explorations by visiting the following website www. ibmathtutor.org/ib-math-exploration-tips They also provide online 1-1 guidance, which I would very much recommend. It's 50 dollars(approximately 39.7 pounds) per hour, but in 3-4 hours you will get all you need for writing a perfect exploration. They in fact provide much more than general comments, guidance. You will have a clear topic, clear steps for each part of your exploration(so that you are simply left with writing the work carefully following the guidance) and tons of advice to secure a perfect score. You will also be provided a free detailed review of your draft work whenever you finish, so as to make sure all the criteria are met.