On German pronunciation

I'm aiming to reach B2 and pass its exam by June/July of next year and I'm currently on and off studying because of work and how life can get busy sometimes.

Mostly, I'm self-learning through some recorded courses I found that was designed for people to self-learn during Covid lock-down and I had a conversation with a friend of mine yesterday where he suggested I should enroll in a live course in my city which I find to be a little challenging because of my limited time.

I'm very concerned I might not be learning pronunciation correctly as I learned that someone had struggled to pass the b2 exam because of his pronunciation during the speaking test and passed the rest of the skills.

What are your thoughts on this? Should I keep doing the self-learning or should I find a way to enroll in the course?