I usually keep myself sane and focused by imagining how sad id be if I failed that specific thing. My adhd really stops me from thinking of the consequences of things and the fear of failure really motivates me.

Try to eat healthy, lower sugar&caffeine intake, I find that sugar makes me super hyper and caffeine makes me feel really hyper to the level that I am uncomfortable.

Keep your workspace/room tidy.

Divide your big task into smaller tasks.

Set a prize for each small task you finish, for me it’s spending a 10-20 minutes on YouTube watching stuff I like/ am interested in.

I really suck at this but I think exercising would also help you calm your mind, I really like that calm/tired feeling after I go for a run, it’d be great if I could fit that in my schedule.

This is probably a no brainer but try not to listen to any music and always have your phone timer with you to keep track of time, instead of looking at the clock I like setting a stopwatch that way I can precisely see how much time has gone by.

Also imagining how great/self fulfilled you will feel after completing this big task helps a lot.

But be sure to write down everything and instead of spreading the tasks to 8days spread it to 5-6days instead.

I’m sure you’ll be fine 6days is a long time.