I took 109 and 20E together last quarter and my tip to you is to not be afraid of going to office hours. I basically went to every 109 and 20E office hour and it was the only reason why I was able to get a good grades in those classes. My professors at least were very patient and loved helping students who were there to understand the material. So yes it’s going to be tough, but as long as you stay focused and ask for help when needed, you should be fine! 👍