The text you are referring to is a specific supplementary book titled
Notation, Concepts, and Conventions: A brief review to set the stage. The text you are referring to is a
Special and general relativity are conceptually demanding subjects where intuition often fails. Standard textbooks (e.g., Misner, Thorne, Wheeler; Hartle; Carroll) provide rigorous derivations but often leave students with insufficient guided practice. A collection of “300 problems with complete solutions” addresses this gap by offering graduated, computational, and conceptual challenges. This paper examines the hypothetical but representative structure of such a PDF resource, its utility across academic levels, and caveats regarding its use. "Problems in General Physics" by I
: The problems were developed and refined over two decades of teaching at the KTH Royal Institute of Technology in Stockholm. Accessibility William H. Press