a suprise, which weren't a suprise

okay, I'm not a smart, gifted kid. ( mostly in math ) You know, people like me, would be very proud of getting an A/95 in her test. So I got 95 in my math quiz, I was so excited ! ! 

When I got home, I unpacked my bag and get that paper out. I excitedly walk fastly to my mom's room, and show my test. And this was my mom's reaction;

"What are you doing here? ( then she saw the test) Ooh . Good. ", with no expression at all, showing no excitement, nothing, but a single word, who mean almost nothing.