1. Mathematics: Math courses cover a variety of topics, from basic arithmetic to algebra, geometry, calculus and beyond. They help develop logic and reasoning. 2. Physics: Physics courses explore the fundamental laws of the universe, including the principles of motion, energy and matter. They help us understand how the world works at a fundamental level. 3. Computer Science: Computer science courses teach digital skills, ranging from Internet browsing and office automation to programming and software development. They prepare students for an increasingly digital society.