PL/pgSQL Case Statement

DO $$
DECLARE
    test_score INTEGER = random()*10;
BEGIN
    CASE
    WHEN test_score BETWEEN 0 AND 4
        THEN RAISE notice 'your test score is % and that is realy bad, you must have more learning if you want to pass the exam', test_score;
    WHEN test_score BETWEEN 5 AND 7
        THEN RAISE notice 'your test score is % and what job will you get with that score,(if I were you I will go
self-taught and learn other things that you cannot learn just from school ;), if you don''t wana be a civil servant, )', test_score;
    WHEN test_score BETWEEN 8 AND 10
        THEN RAISE notice 'your test score is % and that is a good job, bot don''t be proud of that or you will getting your self on behind', test_score;
    ELSE
        RAISE notice 'Error';
    END CASE;
END $$;