Mitigating circumstances

I had a family tragedy earlier this year and it disrupted my education for A levels. I took Maths, Physics and computer science. I self learned the entire maths course, but I had gaps in my knowledge for Physics and computer science. by the time exams came, everything was fine, except I self learned some of the modules i missed out on earlier on the year. This obviously affect my performance in my exams. I was predicted an A*A*A but will likely get an A*AB. which is still good but it wont get me to my firm.
I recently found out we were supposed to inform the exam boards about these situations, but i had no idea. if my firm choice is in clearing (and it surprisingly was) can i still tell them about it and ask them to just judge my grades with a bit of context.