The Skanavi collection is . It is best suited for:
"Problems in Mathematics for Entering Universities," edited by Mark Skanavi, is a renowned collection of mathematics problems used for rigorous university entrance exams in technical fields [1.1]. The collection is noted for its three difficulty levels (A, B, and C), covering topics from foundational algebra to advanced trigonometry and geometry [1.1]. The text is frequently searched and accessed via academic platforms like the Internet Archive and Scribd. Skanavi Pdf
Often, the PDF is split into: