I understand around 70-80% of the audio on B1 level. Although, due to minor errors, i score myself around 45-50 out of 60 most times. Is this the right level for me, or should i just move on to a harder level (B2). Also, out of curiousity, do these exercises really help in improving listening ability? I ask this because in real world scenarios, we would not have the opportunity to replay the audio when people are speaking to us. I would like to know if this is a tested way to improve listening comprehension, since this is my priority for now...Thanks!