no you can still raise them beyond what it says. they more guide lines on what to aim section so that you don't hit any issues down the line, you increase they score by too much.
The way you increase is you repeat each scene with the character to reach the amount of points you need.
or you can do what I do. do the scene at least twice or three, at least that way you can open up any new options that may be available. the use the cheat hallway to increase the points to the amount the section mentions and then move onto the next section. Just make sure you have done all the scenes at least once or as many times as mentioned in the walkthrough.