Thanks so much for your thoughts on this.
In case someone in the future has my same question of how to best break through rust after a GMAT hiatus, I found the following to be effective:
To warm up, I did the first 25 problems or so in the GMAT Quant book. They are easy, and help turn your test taking brain back on.
Since math is more my weakness, I went back to the beginning of my math books, and practiced the foundations/ fundamentals that are the building blocks. Since I use
Manhattan GMAT, I reread the Number Properties books and did the problems again. This helped me remember concepts and brought them to the forefront of my brain. It was helpful to revisit this book since it was one of the first things I tackled my first try at the test. I also did some of the chapters from the Foundations of GMAT Math book in which I thought I could use more practice. Although the Foundations book is conceptually more basic than I need, I found that the long problem sets were very good at helping me get quicker at manipulating numbers and performing operations.
I have been working my way through the books again, and after about a week, I feel like the rust is gone.
I'll write a entry about how I nailed my retake when I take the test in two weeks. This is just my brief strategy to get rid of the rust.
Happy studying!