NEW PSAT PREP

What’s the best way to prepare for the PSAT? I took it for fun without practice in 9th grade and I got 1270 total(96th percentile), with 610 reading/math (92nd percentile), and 660 math(97th percentile). I’m confident that if I take it for practice in 10 grade my score will improve just because I have a better feel for the test. Is it a reasonable goal to try for National Merit Scholar by 11th? Any steps, methods, or tips in doing so would be appreciated.