ISBN: 0837381703; Copyright Date: 2010; Book Title: Related Technical Subjects (Biological & Chemical), Sr. H.S.;The National Teacher/PRAXIS Examinations are designed to provide objective measurement of the knowledge, skills and abilities required of teachers. The test results are used for the various levels of teacher certificationÌÔinitial, qualifying, validating, statutory, incremental, promotional and/or supervisory.Each book is 8 1/2" x 11" in paperback (plastic bound) and lies flat for ease of use. Hardbound editions available as special order at additional charge; please inquire.