Not a ton of advice on a specific schedule, but what's helped me is just taking a ton of practice tests. Starting with the oldest first so that I take the newer tests closer to the test date. I think it's helped me learn to deal with the fatigue of the exam, and encounter a lot of formats so I am familiar with every variation of question/question type. Don't burn yourself out tho.

@Orangesunshine this post has singlehandedly turned my MSS questions around - thank you. so simple, yet never thought of it like this