Hi @Salar Hussein
Just to add to my colleague's answer: You apply to have your school certificates recognised with the recognition office of the Bavarian school authority (Zeugnisanerkennungsstelle - Landesamt für Schule). It does not cost anything. Here is the application form:
https://***.las.bayern.de/zeugnisanerkennung/allgemeinbildende_schulabschluesse/downloads/Antragsformular_ZASt_englisch.pdf
You have to indicate on the form for what purpose you need to have them recognised.
I cannot say how long it will take but generally it is a lengthy process.
You can go directly into an Ausbildung without finishing the Berufsschule. It depends what kind of Ausbildung you wish to do. There are some where a school certificate is not required but many which require one. Depending on the complexity of the Ausbildung, they will ask for a Hauptschulabschluss, Realschulabschluss or Abitur.
I am not sure what you mean by going directly into the Abitur. Do you mean going to a Gymnasium and doing the Abitur or going to a night school (called Abendgymnasium) to get your Abitur? To go to night school you have to be at least 18 and either have a recognised school certificate at Realschule level or pass an exam.
I recommend you contact the service ‘Jugendmigrationsdienst’ as my colleague suggested. This is a special service for young migrants and they have expertise in things like having foreign school certificates recognised.
Best,
Éanna