My son is in 10th grade and he is generally a B/C student. We've had battles for years over his grades. I finally said he must get all 90%'s from now on or there will be a major consequence. He has been diagnosed with ADHD (twice). He hasn't made all 90's and now I'm wondering if I'm being too harsh on him. He's almost an Eagle Scout and he puts a lot of time into music studies.