Please I need SERIOUS HELP IMMEDIATELY

So basically today as u all know was results day.
And I was sooo shocked of the outcome….I got D in math E in physics U in chemistry and B in French
I AM SURE I GOT Bs and Cs before result day because I checked all papers with the mark schemes I WAS 100 percent sure for Bs and Cs
I remembered everything what I wrote
I think there is a mistake with the grades I clearly remember.

Has this happened to anyone before? Any advice??
My dad wants me to repeat the year but I am not willing to stay another year in y12….

PLEASE HELPPPP!!