The phrase "catch up with" is a phrasal verb in English that has a few different meanings. Let’s break it down in a simple way.
To make up for lost time or missed work: This means to complete tasks or learn things that you missed because you were absent or busy.
To reach someone or something that is ahead of you: This means to go faster so that you are at the same place as someone or something that was in front of you.
So remember, "catch up with" can refer to both making up for missed work and physically reaching someone who is ahead.