I agree with Copyright but would add that "bump it up a notch" does not have to be used only in the context of formal levels, such as going from algebra to geometry. It can also be used in referring to any effort to increase the intensity, difficulty or complexity of any activity.
Also, be aware that this is informal English; you would not write in a job application that you wanted to "bump my career up a notch."
One last comment to agree with edgy about increasing your skill in any activity: martial arts come to mind with their belt levels: white, yellow, green, blue, brown, black, for example. You're still in the same martial art but increasing your knowledge of it at every new level.