If you are managing you time well, completing your tasks, and leading a fulfilled life, then you are in control. The overall goal of personal effectiveness is what counts regardless of which strategy we use. Before you buy a new computer to help you manage your time, think about how much time it will take to assemble and learn to use it. This is time to do nothing and feel free of guilt. Even a few minutes can yield a sense of renewal.
Some people start early in the morning, others find after midnight their most productive time.
If you don't know, experiment a little. Use waiting time. Those short periods between class, waiting for the AppalCart, or standing in line can be very valuable. Carry 3X5 cards you can use during these short period to study chemistry or foreign language verbs. Use breaks between classes to study notes, read your notes into a tape recorder that you listen to on the way home on weekends.