What works for you will probably be some unique combination of studying, solving puzzles, and playing games.
I was stuck at 800 for a while, because I just kept playing games and doing nothing else. Then I started watching beginner YouTube videos and I went up to 1200. Then I started solving puzzles and I went up to 1400. I really just wanted to play games, so it was hard to do the other activities that made me better. I had to discipline myself by saying things like, "No more games until I watch 3 videos." What works for you will probably be unique to you.
Make a general plan, but don't be afraid to change that plan when you find out what is helping you most. I think that once your rating goes up, you will be happier and you won't be fixated on "1200 in one month", you will re-fixate on just improving and seeing results.
P.S. I got suck in the 1400s for a long time and right now I'm currently stuck in the 1600s.
It’s an interesting project. I’ll be following with interest. You can of course overwork it so stay fresh!
When are you starting?
Just finishing up some stuff that I need to get done, but basically today. I have no obligations for all of August. I will definitely be keeping you guys up to date on progress