Computer Organization and Architecture is the toughest subject in GATE CSE but average marks can be easily scored in topics like Cache Memory, Pipeline, and Addressing Modes. It is difficult to grab but once you grab it, it becomes the most interesting subject. The subject includes Machine instructions and addressing modes, ALU, Data‐path, and control unit, instruction pipelining, Memory hierarchy: cache, Main memory, Secondary storage, and I/O interface with a weightage of 6-9 marks. Here we are going to provide you with previous year's questions of COA. Solving these questions will help you to prepare more proficiently for the GATE exams.