Make sure that you know how to spot each punctuation error before you go on to the next.
Read Orr, Daniels, and Henson, pages 77-78, 147-160, 171-184.
Read Troyka, pages 400-471 (8th edition).
Practice:
Proofread the text on pages 163-169 and pages 187-193 of Orr, Daniels, and Henson.