I got a a 140 on my first practice test and this was after doing Powerscore LG Bible months before. Im pretty sure I wouldve gotten a high 130s on my cold diagnostic. I ended up with a 161 and it took about 2 years to get there.
Took me about a year. Mind you i could barely get 2 or 3 questions right when i stsrted. After a couple months of the lg bible leading up to my first 140 diagnostic, I would go 5 out of 23.