Scores Output + Skipped Attempts + Repeated Equations

I have written a program in C language. The program is designed for primary school students in Grades 1-2. Two integers are randomly selected, the numbers are either added or subtracted to form an equation, and the students are asked to solve the equation. (I'm using Xcode v12.2 to code)

Code criteria:

a. Each round of the game consists of 10 questions that are not to be repeated. 10 marks for each question. Each round of games is required to be set anew and is not have the same questions...

Scores Output + Skipped Attempts + Repeated Equations