Science and Health can, and will, if you stay with it, change your life for the better in ways beyond what you can currently dream. It has done so with my life, and with thousands upon thousands of others, around the globe, for over a century.
However, this particular copy, to my knowledge, is the only Authorized paperback version of Science and Health (by Mary Baker Eddy) available for sale on the Amazon web site. Authorized, in this case, means authorized by the Christian Science Board of Directors - i.e. the Directors of the Christian Science Church which Mary Baker Eddy founded. Since the Church's copyright on the book has expired, others may legally print the book, but the only way to be absolutely certain you are getting what the author, Mary Baker Eddy intended, is to purchase a copy that has been authorized by, and published by, The Christian Science Board of Directors. For example, many of the other, no doubt well-meaning publishers who have copied this book, have left off certain key chapters.
The other way to determine whether the copy has been authorized by this Board is to examine if the circular Cross and Crown seal appears on the front of the book. The Church's registered trademark for this Cross and Crown seal is still in force, and that also assures the authenticity is genuine.
Now, buy it, and read it at a pace you are comfortable with. A few pages before turning the light out at night is one good way to begin. Be prepared to be challenged as to your core beliefs as to what is real and what is unreal. It matters not whether you agree with everything you read, but it would be well to place your primary focus on what you do agree with, setting aside for the moment what you do not understand and cannot accept. In most cases, on the second time around, what you had thought was a problem will simply have disappeared, and your happiness, and general well-being will have moved forward in the process.
Enjoy. You are about to take up the read of your life.