The ‘RETRY A QUESTION’ mixes up all of the examined 11+ subjects and cannot be filtered. The ‘DO QUESTIONS NOW’ (also known as Shuffle) is the same.
You only way to target specific maths questions, that your student had incorrect, would be when you review completed maths tests, as you can then clearly see any incorrect answers given by a student – it’s always a good idea to review tests/exercises. If you wanted your student to work out the answer again, you could then read it out or write down the question. Alternatively, you could carefully not show your student the multiple-choices or explanation for an online question review so that they have to work it out again.
I hope that helps.