Note : I want to speak farsi and not read and write.

I am a native hindi / malayalam speaker. What's a good book to learn on your own? I tried studying with a teacher and it's not progressing​​ anymore.

I would say my current level is A1. I understand basic grammar and sentences. But I cannot form a sentence fast and ​​vocab is meh.

Looking for advice from someone who has done it already.