I took my exam last April and wore mask during the entire exam. Di naman naka-affect sa score, I got 90 overall score. I wore 3-ply surgical mask para may space pa for breathing. Iyung ibang kasabayan ko sa testing area were wearing cloth mask, mukhang mas mahirap magsalita kapag ganoon.
Anyway, you will have time to test your microphone and listen to your voice before the Speaking section. So make use of it to ensure na maayos at malinis pakinggan ang voice niyo when speaking even with mask on. ๐