Has anyone here dealt with hypothyroidism while preparing for CA exams?

I was diagnosed with hypothyroidism (very high TSH - 84) and have been taking Levothyroxine/Thyronorm 75 mcg for the last 5 weeks. I do feel better than before, but I'm still struggling with significant brain fog.

My biggest issue is memory. I study something, but later it feels like I can't recall it properly. I've also failed multiple CA attempts, and now I'm wondering if my thyroid has been contributing to this all along.

I usually sleep 7–8 hours. I can focus well in the morning, but after a few hours of studying, the brain fog comes back and it becomes very difficult to think or remember what I've studied.

My doctor has only prescribed levothyroxine so far.

Has anyone experienced something similar?

My CA exams are in September, so I'm feeling quite worried. I'd really appreciate hearing from anyone who has gone through this.