Hi there!
I'm certified GA/GTM specialist and I'm ready to help you.
I must warn you that I made one test form submit on your website and I marked it. I did it just to get familiar with your problem.
I can't say for sure whether each question could be tracked independently there. This should be viewed in GTM debug mode. If each question has something unique, I can track that for sure. And there are more than 15 questions, that's a lot of work.
Form initiation and completion can be tracked easily, I can guarantee that. For this kind of work the price would be around 250 USD + 30 USD freelancer.com fee. That would make 365 CAD.
Well, If you are interested, drop me a message.
Looking forward to hear from you soon.
Best regards,
Khusrav