a few questions

Hi everyone.
I am a recent mba graduate from the Singapore campus of an Australian university. I now want to take the GMAT and try for an mba in usa. Could you please help me with all or some of the following?

1) Is a score of 600 decent enough?? I will try for 650+ though, but it will be tough for me.

2) Is there any website where I can learn how many correct answers corresponding to how much marks. Like if I got 25 right in Quants and the rest wrong…….. then how much would I get? I am looking for a chart. Oh and is there negative marking in GMAT ??

3) Should I get all the reco letters from professors or should there be at least one from a professional referee (my ex boss)

4) Could you name me some ordinary American colleges (B-schools). I do not mind if they are NOT AASCB accredited, as long as that wont be a problem with my Visa chances (I am from India). I am specifically looking for colleges which have Spring/January start dates and have MBA programs which are preferably 1-1.5 years in course duration

5) Is there any internet source you could refer me to, where I could get tips and advice about the Critical Reasoning questions of the verbal section (my weakest section)


That’s it for now. I know that’s a lot of questions for a first post, but please bear with me. Thanks for your time and help.