A frequent representation seems to exist concerning the existence of an “automatic” fall of the marks between the final class of the secondary school and the first class of the high school. But what does really happen ? We undertook a research on this point starting from a sample of 494 pupils. The results show that there is indeed a significant average fall, about 2 points (on 20) on our sample, but this one is variable according to school discipline and pupils. The importance of this fall questions us on the degree of coherence between the evaluation practices (and teaching practices) of the teachers of these two school levels.