Difference Between Practice Test Score and Actual SAT Score?

I’m been doing the practice tests in the Official CollegeBoard book. Is the difficulty of the real SAT the same or harder compared to the practice tests? If I’m scoring around a 1530 on the practice tests, what should I expect on the real thing?

I typically scored way higher on the real thing, and I think that might be due to the curve

You should expect a similar score on the real test. You have nothing to worry about, your score is great.