This data asset provides data related to the cost effectiveness of corner libraries, conducted by the Pakistan Reading Project (PRP) during 2018-20. The study aims to identify the degree to which the provision of classroom-based corner libraries improves student reading outcomes. It utilized a mixed-methods experimental design with two treatment arms and costing data to identify the cost-effectiveness of corner libraries on student reading skills. The research sample for the quantitative impact evaluation of the study was comprised of 80 schools in Khyber Pakhtunkhwa (KP) that were randomly assigned to receive different treatments: 50 schools receiving the PRP+corner library group (Reading Learning Material or RLM, face to face trainings, Teacher Inquiry Groups or TIGs, school support visits, and corner libraries), and 30 schools receiving all ingredients but no corner libraries. Our analyses indicate that at baseline, the PRP+corner library group and PRP group had similar characteristics, which suggested that randomization worked. Baseline quantitative data were collected in April-May 2019 by enumerators who had previously participated in the EGRA data collection as part of other studies conducted by PRP. Endline quantitative data were collected in December 2019 by almost the same group of enumerators, who received another 5-day refresher training. Both at baseline and endline, enumerators used Tangerine, a tablet-based data entry interface built specifically for conducting EGRA.