Dear Wasim Ahmad,
Welcome back to the Wefugees Community and thank you for your question.
If I remember correctly from one of your last posts, you are currently holding a residence permit according to section 104c ("Chancen-Aufenthaltsrecht"), correct? You are right, in order to receive the residence permit according to section 25b after 18 months, you need to prove that you speak German on A2 level (spoken skills, not necessarily writing/reading skills). There are exams, as you mentioned, which test you up to B1 and may certify an A2 level as well - according to your performance. But there should be A2 exams as well. I made a quick research and found some telc exams offered by different organisations/institutions (for example in Bamberg or Aachen).
It is good that you already take care of it since I heard that in some areas it is really difficult to find a place and waiting lists can be long (there are in general not enough language courses and exams - especially after the introduction of the "Chancen-Aufenthaltsrecht"). Maybe you can share your approximate location with us, so we can support you with searching for some options in your area.
All the best,
Meike