Bei einer Bewerbung vor dem Ende der Lehre, kannst du ein Zwischenzeugnis von deinem Arbeitgeber anfordern. Das Zwischenzeugnis kann dann bei Ende der Ausbildung in ein endgültiges Ausbildungszeugnis umgewandelt werden!

http://www.azubi-azubine.de/mein-recht-als-azubi/ausbildungs...

The Interim Certificate
Occasionally apprenticeship programs may provide interim certificates for apprentices who complete a predetermined portion of the apprenticeship program. For example an apprenticeship program may offer an interim certificate when an apprentice has successfully complete two years of a four year apprenticeship program. These certificates are provided by the apprenticeship committee and are recognized by the employer of the apprentice. The interim certificate:
• Provides an opportunity for an apprentice to take time off of the program with recognition of the work already completed
http://www.ajactraining.org/roles.html