The main objective of this study was to assess the effect of a learner-training program based on timelines to improve fifth year students’ learning achievements in social sciences at Colegio Nacional Iquitos secondary school 2021. The study is evaluative in type with designs of field study, transactional contemporary, univariate, and quasi-experimental. The main data gathering tool was a valid and reliable performance test. Results show that the experimental group outperformed the control group as their mean score was higher (13.750 > 8.798), with most students of the experimental group (60.7%) being at “in process” achievement followed by 35.7% at “expected” level of achievement, whilst most students of the control group (76.9%) being at “beginning” level. The same happens in its dimensions: Construction of historic interpretations (12.917 > 8.141), responsible management ...