In 1928, when he was seventeen years old, Ledermann graduated from the Leibniz Gymnasium and received the necessary certificate which allowed him to study at any German university.
Sa 1928, kapag siya ay labimpito years old, Ledermann nagtapos mula sa Leibniz himnasyo at natanggap ang mga kinakailangan na sertipiko na pinahihintulutan sa kanya upang mag-aral sa anumang German unibersidad.