A 900 PSAT score is approaching average performance, placing you in roughly the 47th percentile for 11th graders. This score indicates solid foundational skills with room for improvement to reach above-average performance. You've shown competency in most basic math and reading/writing concepts, demonstrating that you understand the test format and have developed adequate academic skills. This performance suggests you're very close to matching the national average, which means you're on track for college-level work with some additional preparation.
Since you're very close to the national average of around 920, targeted preparation focusing on your specific weak areas could yield significant results. With consistent study, you could realistically aim for 1050-1150+ on the SAT, which would be competitive for many colleges and universities. Focus your preparation on the areas where you lost the most points, whether that's specific math topics, reading comprehension strategies, or grammar rules. Small improvements in your weakest areas could easily push you above average performance and into a more competitive range for college admissions.