Yes. Definitely. I raised my score from 1760 to 2100 in a month of studying. A couple more weeks and I raised it to a 2250.
First, I disagree with the poster above me. Flashcards are a waste of time. Get the book PWN the SAT, or spend some time on the blog of the same name. Lots of info overlaps between them. It's mainly just for math though. It basically lays out exactly what types of problems appear on the math section, and tells you how to solve them in very easy ways, using very little actual "math class" math. Raised my score 150 points.
Also, you need the blue book. 10 tests. Published by College Board. Go through it along with PWN the SAT. Practice as much as you can. It will raise your score. But don't just do the tests, look through every single question you do, even the questions you got right, after you finish the test/section. Understand what the questions are. Find the patterns in the questions. Basically the entire test, in all sections, just asks for variations of some set of ideas or questions over and over. Find the patterns, find the best way to solve them. Make sure you truly understand the test.
Now, you may not have time to do all that in a month, but if you only want to raise your score 100-200 points, most of that work is probably unnecessary. But yes, you absolutely can improve your score in a month.