What, Where, When, How to everything that you can. This encourages good thinking skills. Praise the children for the good they do. Don't overdo it though. Too much criticism will make the child feel as though they can do nothing right, so why should they even try.
Concentration is better with quiet.
Don't label children. It may at first seem good, but it may backfire. Children should be able to think that they can BE or DO anything. This summer I had trouble convincing my five year old son to sit still long enough to get any studying done. After about 15 minutes of GOOD study time he would start to fidget and squirm.