They teach you the "standard" way to present a proof or a calculation. Self-Correction:
: Convergence, limites et suites usuelles. Mathematiques Generales Cours Et Exercices Corriges Pdf
Mathématiques L1 - Cours Complet Avec 1000 Tests Et Exercices Corrigés " which is frequently used by university students. They teach you the "standard" way to present