Louis Janda's book is divided into five sections, each containing five tests, under the general headings of "Getting Ahead" (intelligence, work and life experience); "Getting it Together" (Self-esteem and self-image); "Getting Along" (Your intereaction and social style); "Getting Together" (Your relationship styles) and "Getting it on" (Your sexuality and intimacy preferences). There is only the briefest of introductions on how to use the book and the metrics of psychological tests, and at the end of each test Janda includes only a few VERY brief statements about the development of each particular test, and the meaning of your results.
These 25 tests were, indeed, developed by psychologists and researchers, and they certainly have the potential to teach you a thing or two about yourself. However, the nature of this "book of tests" also means that there simply isn't any significant room left over for interpretation of test scores, nor for helping the reader *apply* the information to their own self-growth. As such, I would be happy to recommend the book for someone who's already familiar with psychological testing-- however, if you're just getting *started* on the concept of psychology, I expect this text would leave you with the thoughts "OK, so these are my results. Now what???"
Final thoughts: Recommended (7.5 out of a possible 10 bookmarks), but mainly for those who already have some familiarity with psychology and testing.