To improve your grades in Engineering Thermodynamics, focus on developing a deep understanding of the fundamental laws and principles, including the zeroth, first, second, and third laws. Practice solving problems systematically, starting with simple ideal systems and progressing to more complex real-world scenarios. Pay attention to unit conversions, sign conventions, and graphical representations like T-s and P-v diagrams. Review and master key concepts like entropy, enthalpy, and efficiency, and apply them to various thermodynamic processes and cycles. Additionally, work on visualizing and interpreting thermodynamic systems, and seek help from instructors or classmates when needed. By staying organized, persistent, and practicing consistently, you'll see improvement in your understanding and grades in Engineering Thermodynamics.