ALL courses are 15 CE's and $40. Some of the course reference text books have two courses within one book. With the two course book you will only have to pay for one course book for two tests, but if you want to take two tests using that one course book you will have to purchase two tests. If you only need 15 CE's to renew your license you can use the first half of course book for 15 CE's and use the second half of the book on your next license renewal in two years. In California nurses and respiratory therapists are required 30 CE's to renew their license. Therefore some course books will satisfy all your CE requirements for one license renewal period. If the course book has two courses within the same book they will be titled as "Part 1" and "Part 2". Other courses have one book for each 15 CE's only. If the course title does not have a "Part 1" or "Part 2" then the book is only used for one 15 CE course.