What are the best study techniques for Engineering?

I'm currently in my second year studying Engineering and I'm really struggling with my coursework. Despite putting in long hours, I'm not seeing the results I want and my grades are suffering. I've tried different approaches like reading textbooks, taking notes, and reviewing past papers, but nothing seems to stick. I feel like I'm missing some fundamental study strategies that could help me understand the material better and retain information more effectively. Could anyone share their proven study techniques that have worked well for Engineering? I'm particularly interested in methods for understanding complex concepts, memorizing important information, and preparing for exams. Any advice from current students or graduates would be incredibly helpful! I'm currently studying at Federal University of Technology and would appreciate any advice from fellow students or graduates who have been in similar situations.