The biggest criticism of the Krishna Series is that it is "solution-driven, not concept-driven." If you just copy solutions, you will fail your theory exams. Here is a study strategy:

When searching for PDFs, be cautious of copyright laws and the legitimacy of the source. Accessing copyrighted material without permission is illegal in many jurisdictions. Prefer legal and official sources for your studies.

Theory of vibrations and stability near equilibrium. Useful Resources & PDF Access

: Moments and products of inertia, principal axes, and kinematics in two and three dimensions.