Howdy!
Hope you both don't mind me butting in. Someone made a thread recently about doing AH languages and I honestly think my advice to them would be applicable to you as well:
https://www.thestudentroom.co.uk/showthread.php?p=88309530&highlight=All in all, just remember that you really, really don't need AH qualifications at all. They really can take up a lot of your time and amount up to quite a bit of stress. That said, I would
highly encourage the experience of doing one, especially if you want to go to university after. And, if you're thinking about doing a foreign language at university, then I'd recommend you doing an AH language all the more. However, unless your timetable is completely free, you have nothing better to do and you're cruising through the course because it's so easy, then I wouldn't bother with the exam.
Please, please just remember to focus on your Highers for entry into university and the
experience of doing an AH course. Sitting the AH final exam is not required at all; you can just do the course throughout the year and then choose not to sit the exam. I wish I had done this!
Doing AH Spanish helped me soooo much with university level French and Spanish but my situation was less than ideal because I had to to travel to another school every other day and the teachers were pretty bad... I somewhat wish I hadn't sit the final exam because it really wasn't worth the stress.
Anyway, if either of you need help with languages or AH French/Spanish, let me know - I've done a degree in both and I tutor students from Nat 5 to AH.
P.S. Neither AH Spanish nor AH French were offered at my school. I did AH Spanish at another school and ended up self-teaching AH French (but not sitting the exam unlike Spanish).