Key subjects for the Graduate Aptitude Test in Engineering (GATE) for mechanical engineering include Production Technology, Engineering Mathematics, and General Aptitude, which carry significant weight in scoring. Other important topics are Industrial Engineering, Fluid Mechanics, Strength of Materials (SOM), Thermodynamics, and Machine Design, each contributing varying marks to the overall exam. Understanding these subjects is crucial for effective preparation and success in GATE. The discussion emphasizes the importance of practical application and iterative testing in engineering to grasp these concepts fully. Mastery of these subjects is essential for aspiring mechanical engineers aiming to excel in GATE.