This study aims to test the validity of the Dispositional Variables (IEPA) scale,which evaluates students' learning interest, progress, and effort, and of the Contextual Variables (AYES) scale,which evaluates whether the teacher helps students to learn, values theireffort, and can arouse their interest in the subject English as a Foreign Language in Compulsory Secondary Education and Higher Secondary Education. Other aims are to determine whether personal variables affect the scale factors and whether contextual variables can predict dispositional variables. Participants were 1086 students from public and private schools in Oviedo (Spain) who completed a questionnaire composed of the scales, and which also collected personal and family data. The statistical analysis was carried out using the programs FACTOR.10 and SPSS.24. The results of the analysis of the factor structure and internal consistency showed that the scales were suitable to be used in the context of the English as a Foreign Language subject. Students' perception of the teaching context, in terms of support provided, positive assessments, and motivation, predict their interest, progress, and effort made in the subject of English.