The King courses are excellent except for John King's lazy eye and Martha's helmet hair. A little corny and boring at times but they all are. I used them for my instrument and the three A&P tests and got mid 90s on all of them. The best way to do it is to do one chapter and the workbook a night then take a couple of practice tests and go take the test as soon as you can. Don't drag it out just get it done.