Make your original notes legible enough for your own reading, but use abbreviations of your own invention when possible. The effort required to recopy notes can be better spent in rereading them and thinking about them. Although neatness is a virtue in some respect, it does not necessarily increase your learning.

Copy down everything on the board, regardless. Did you ever stop to think that every blackboard scribble may be a clue to an exam item? You may not be able to integrate what is on the board into your lecture notes, but if you copy it, it may serve as a useful clue for you later. If not, what the heck -- you haven't wasted anything. You were in the classroom anyway.

Sit as close to the front of the class, there are fewer distractions and it is easier to hear, see and attend to important material.

Get assignments and suggestions precisely - ask questions if you're not sure.