Btec student/alevel maths private candidate ucas application

I’m currently in Year 13, studying a BTEC Level 3 Extended Diploma in Engineering at college, while also self-studying A-Level Maths.

I’m in the final stages of completing my UCAS application and need some guidance on how to include my A-Level Maths in the education section. I’ll be sitting the exam at my college’s sixth form in June, but since I’m self-studying and not attending formal classes, I don’t have a specific start date.

How should I go about adding this information to my application? Any advice would be much appreciated!

The general advice I seen given here on TSR by people more knowledgeable than myself is to list yourself as attending part-time, with a start date (and end date, if necessary) which tallies with the exam period itself.