GMAT Advice - Please help

I have ~3 months to take the exams for early admissions programs such as HBS 2+2. Didn't do too well on the SATs but walked in with 0 practice. I'm willing to work as hard as I need to for the next few months.

For those of you who have taken the exam, could you give me some advice on: - How many weeks did you need? - How many hours per day or week? - Materials you recommend? - Is this an exam you can realistically study hard for and score very high, or is it more about raw intelligence/IQ? - Anything else that would be good to know as I prep

Thanks all. I know there's some older threads on this but figured no loss in starting a new one for fresh advice.