I completely get how you feel b/c I was in the exact same boat almost a year prior. I had a diagnostic of 147, and after ~2-3 months of studying (going thru the core curriculum and all), my PT was like a 145 too. I would say I've improved since then, and it all came down to just drilling more + reviewing fundamentals over time, espc since it takes time for the material to be ingrained. I believe you'll see results if you're patient with the process!