Report cards made to look far more important than they actually are. A single report card can't tell who you are or if you are talented or an utter failure. There is simply not enough data. If your parents do believe that your report card tells them who you are or what you are capable of, then there is no way to tell them otherwise.
And what if you failed filipino? Is it important for you, or is it more important to your parents? People are talented in some things and not so talented in others, thats natural. Don't worry about the report card, as 5th said, you are long past the point of no return, so you might as well just go so something fun and productive. Show the world what you are made of
