Interactive ENEM: exams with statistics and free access

The brazilian institute of educational studies and research (INEP) provides National Secondary Education Examination (ENEM) files in PDF format, including answer templates and statistics in other formats. Though public, the PDF format is not well-suited to carry out interactive exams over the web. This work presents a solution that carries out convertion of all exams from PDF to HTML format, enabling students to mark the answers, visualize their scores and see graphics about the difficulty level of each question, statistically calculated from a sample of 10,000 candidates. Our solution was evaluated by volunteers in the academic community, reaching an approval of 97% in an open pool with 56 respondents.