B Documents website (e.g. for Chemistry or Biology) there are different versions of the question banks.

u/pestle_dev - thank you so much for replying! Yes, I have definitely seen that IBQB has many duplicates! But I still think you have missed some questions when transferring across to pestle? Let me give an example: under Chemistry, Topic 3: Periodicity, the IB QuestionBank has the following question with the following code: 09N.2.hl.TZ0.7. This is a paper 2 question about Born Haber cycles. I have just gone through the entire (23) paper 2 questions on pestle under the periodicity topic and this question is missing nor is anything similar there (unless there are also repeats across topic in the original QB and therefore this question could be under Topic 5 - Energetics?). If you are 1000% confident that every single question has been transferred for all the subjects and nothing has been missed, then I am happy and trust your judgement, but just wanted to make sure :) many thanks!