I had English and Chemistry AP test this week, I feel your pain. I like both private lessons and group clinics. They both offer something different. The personal attention is always nice but I feel I improve most playing against other players. That way I can learn how to play against different styles and can build about confidence in playing match situations. Without first hand experience of playing other the private lessons could mean nothing. There was this kid on my tennis team who took lessons weekly for two years but never played with anyone else. Now his strokes are very nice and perfected but he loses everytime in an acutal match.