Telc B2 in three months?

I have exactly 3 months to pass Telc B2 exam. I have full day to learn B2. And my current level is B1 but in reality i feel like my spoken Deutsch is very basic. And i have no sense of any grammer rule of german. I have been living in germany for a long time so i get some understanding even without grammer.

I passed the B1 exam by just doing some model papers and it was not hard. I left the the grammer portion of the exam and i think i got only 5 or 9 marks in that Teil.

But now B2 is making me panic especially the speaking part. And i am not sure what to do. I usually talk with AI but i do not have fluency and vocabulary to have a longer conversation.