For baseline, tools developed by Annual Status of Education Report (ASER) were used to individually evaluate all available students their proficiency in Tamil, Math and English. The tests were administered in the school premises and the scores used as the baseline natural intellectual ability of the students. Each student was tested individually by a teaching assistant who encouraged the student to attempt a question multiple times, and helped with understanding the questions if need be without helping with the answers. The approach was to ensure that the baseline ability was not underestimated leading to a biased effect estimator in the endline. [1] https://asercentre.org/aser-tools/