I know questions similar to mine have already been posted and answered, but I didn't find one that answers my specific question.
I have an audio file where I have a teacher (let's call him Fred) who is within close distance speaking to me. However, in the background I also have a close-by baby talking, a different teacher speaking very loudly on a microphone, and about 50 other people talking to one another in a lower tone.
I'm having difficulty hearing Fred.
For a novice to sound design, what are some suggested tools for me to make out what Fred is saying?