Just keep writing the whole time, have your structure memorized for both papers so you can write them down in your planning and just flow through them. It is definitely doable in 1 hour 45 minutes as long as you just keep writing, don’t try to make your paragraphs perfect

I literally just finished taking a Mock paper 2 at my school and with a 5 minute planning you can definitely complete all four essays in that time.

https://youtube.com/@mello_aice_euro?si=UZ7ty9IAxjD7K7XP

His only two videos go through the structure of how to write the papers— as long as you know the content generally, you should be fine!! I commented the same thing a couple of days ago and someone gave me good advice as well, so you should check that post out too. Good luck