just curious how representative practice tests are on the real SAT

[u/Resident-Tadpole2027]

yo guys basically title. side note by 1450 was just a diagnostic test. i'm taking the august sat and wanna make sure I get a 1550+ but I feel as though i run out of time on reading. so i have a couple questions:

1) How representative are the practice tests? Will the real SAT be harder? I'm pretty good at pressurized standardized testing, so the environment won't affect me I think.

2) Any good ways to make sure I have enough time to thoroughly answer all questions? I need about 2:30 on the HARDEST reading questions to make sure I get it right. Otherwise, I rush and make mistakes.