High school mathematics exercises on exponentials logarithms and circles with difficulty annotations

This dataset contains curated upper-secondary mathematics exercises focused on exponential and logarithmic equations and analytic geometry of circles. Each exercise is provided with its full text, source, topic category, reference solution, and a discrete difficulty label. Difficulty is further documented through annotations based on TIMSS cognitive domains and PISA proficiency levels, each accompanied by a short written motivation explaining the assignment. The dataset is organised into topic-specific files and includes data dictionaries and auxiliary evaluation sheets to support reuse in educational research, learning analytics, and the development and evaluation of AI-based tutoring and assessment systems.