1) Class 2) Course 3) Course of instruction 4) Course of study 5) Propaedeutic 
Propaedeutics or propedeutics is a historical term for an introductory course into a discipline: art, science, etc. Etymology: pro- + Greek: paideutikós, `pertaining to teaching`. Propaedeutics may be defined as knowledge necessary for learning, but not for proficiency. In medicine, the terms `propedeutics`/`propedeutic` specifically refers...
• (n.) The preliminary learning connected with any art or science; preparatory instruction.