Took my first full-length PT three months after studying fundamentals so never had a true colddiagnostic, but I would assume it would've been around low to mid 150s. First official score was 170 and second official score was 178.
My colddiagnostic was a 157 and my first PT after the CC was 168! The CC helps so much with LG, especially if you do the problem sets after the lessons.
... . I started at a 165 colddiagnostic, spent a month mostly just ... skipped large sections. If your diagnostic was similarly high I think ... 160's+ already on your diagnostic or the one PT you ...