I don't go to Dartford, so I cannot help you in that regard. I'll refer you to a post
I made a day or two ago concerning this topic.
- IBID Press Biology Book, good foundation for the basis of your studies
- Allott's Study Guide, good supplement to IBID, and teacher notes
- IBID Press Chemistry Book, reasonable basis for chemistry
- Raymond Chang's 'Chemistry', an excellent book - not so closely tied to IB Syllabus
- Neuss' Study Guide, once again good supplement, not an excellent primary source
- Chemistry in Context (Hill and Holman) - pretty good, I just happened to have it, but as a 4th edition, it covers everything in a well explained manner
- 'Organic Chemistry' (Atkins and Carey) - covers essential things like NMR and IR Spectroscopy to a greater extent - more helpful than others in that respect
- I have an excellent book 'English for the IB Diploma' (Croft and Cross), which has in depth explanations on exam orals, world lit, poem and prose analysis, etc. Highly recommended.
- Nothing else really, read all your study books, and hope you have a good teacher. Our teacher is very proactive, resulting in us accumulating a small forests' worth of handouts.
The IBID books and Study Guides are strictly for the IB Diploma. In the end however, you can get any sizeable book from your library, concerning your subject, and with enough motivation and intiative, you can excel without purchasing any new/other books.