Try raising a different kind of skill point.
Which character do you get repeatedly? If the character is a Universal character (Mametchi, Kuchipatchi, Gozarutchi, Mimitchi, Memetchi, Furawatchi) then you will need to take better care.
If the character is a normal character try playing different games- and pick a different teacher (press A or C when you FIRST meet the teacher with the [ ! ] mail). Mr. Turtlepedia raises humour, Ms. Flower raises gorgeousness and Mr. Canvas raises passion. The games Climb and Tug-o-war raise random skill points, Apple raises humour, Shapes raises gorgeousness and Manhole raises passion.