Ladies, since when are children who don't do very well in school assigned to the "slow learners" gro…

Ladies, since when are children who don't do very well in school assigned to the "slow learners" group? Our teacher suggested getting an "OVZ" status for him. I don't really understand. He's in 7th grade and his studies aren't going great. Some subjects come easier, some are harder, but mostly he gets Cs. I don't know... Oh, and the most interesting part: she says that for us to be referred to the commission, we need to get two Fs in the quarter. In Russian and Algebra. For some reason, I'm very anxious. Why would he need to get Fs if he's calmly getting Cs? Algebra is even closer to Bs for him. What can you suggest?