The first midterm will cover the content from Lecture 1 until Lecture 12. Please see the lecture notes here.
This corresponds to the following chapters and sections of the book

Kenneth H. Rosen: Discrete Mathematics and Its Applications, McGraw-Hill, 7th edition

– Basic Structures (Ch.2, Sections 2.1-2.3)
– Algorithms (Ch.3, Sections 3.1-3.3)
– Induction (Ch.5, Sections 5.1-5.2)
– Counting (Ch.6, Section 6.1)