It is absolutely necessary to read whole text book for SL course??

[cecilgambe7]

It all depends on what you know.  This entire industry/corner of education is based on the idea that a person can prove knowledge of a subject by taking a test.  For years, students took CLEP tests and AP tests and these were generally accepted as evidence of knowledge in the subject area.  Most of the alternative credit providers use this general methodology.  If a student can achieve 70% on a test, then he/she knows the subject and gets the credits.  If you know a subject well, you don't need the book.  If you don't know a subject well, you need the book.  I have had courses in which I have needed the book and many in which I have not.

But SL only offers the book? Or also some lessons as study.com??