We're about to take it this summer!
My daughter is 14, year 9 if she was in school (only just turned 14). We started after Easter last year, so it will have taken us just about a year to complete. We're just about finished now, this week, and will start revision next week. I have a couple of second books for her to just read for revision, until about Easter. Then it will be past papers until the exams which start quite early - in May.
We have worked through Biology for IGCSE by Mary Jones - this was the recommended text for Cambridge which is what we were doing. We've done just a little each day, read a section and answered the questions at the end of each section. As many things as we could do practically, we have. The text suggests various investigations along the way and we've found almost all of them possible to do at home, some with slight adaption.
For revision, we have Study Guide for Biology IGCSE by David Hayward, which is nice and concise, and Biology for you, which is a GCSE book but covers much of the same ground in a lighthearted way. That's all we've used.
I wouldn't really say she's loved it to be honest, but that's because Biology isn't really her thing. She did it firstly because it seemed among the most accessible of the IGCSEs and secondly because she is thinking of a dance career and it's a subject they like. She's been a bit squeamish about some of the body stuff but has conquered that quite well, considering! Be aware that there are long and detailed sections on reproduction, including a need for a thorough knowledge on assisted fertilisation if you are doing the higher level. This is something which I've found no problem with my 14 year old - I'm not easily embarrassed - but was one of the topics which my 10 year old didn't do alongside her big sister as I don't think she would have coped with the level of detail needed! For lots of the other topics, my 10 year old had a go too, because lots of it is fairly accessible. However, it's one I probably won't do with my younger daughter as an exam. She's more mathematical in her approach and I think would prefer Physics or Chemistry. But if you have a child who you think will enjoy Biology, I'd say go for it. We're also doing Geography which I'd say is much harder and needs a higher level of thinking.
Any other questions, just ask!