Since the PISA raw data is now available to the public, the proposed idea of the Education team would be to study the relation between in-class practices and student achievement. Following a study in Colombia revising this subject, the idea is to construct a database that joins students and their characteristics with that of the school, the city, their teachers and directives and the actual in-class practices they get to have on a day to day basis. After this, the analysis would use multivariate regression analysis, with variance decomposition methodologies to determine the relation between this two variables.
Learn more more about their research: Education Research Proposal
Self-efficacy: A quick look at PISA (November 2017)