Portugal's ENES is a set of national subject exams, reintroduced in 1996, that Portuguese students sit selectively based on their target university degree programs — there's no shared universal subject list the way most comparable European leaving exams require. Its most distinctive structural feature is that ENES results never determine admission alone: each program combines a student's exam scores with their three-year internal school average into one applied score, using a weighting formula that program sets independently, so a student's ongoing coursework performance matters just as much as, and often more than, their exam-day results. Because there's no fixed compulsory subject list, a student's actual ENES workload is built entirely around confirming their target programs' specific required provas específicas well before the summer exam period. This combination of program-specific subject selection and a blended internal-average-plus-exam scoring formula makes Portugal's admission system meaningfully more customized, and less purely exam-driven, than most of its European counterparts.