Hi snigdh0699,
If you take the At-home GMAT, then you are not allowed to read aloud (as that action is a potential threat against the security of the Exam - meaning that you might be reading to someone off-camera for help and/or recording questions that you intend to share/sell to other Test-takers). As far as technical issues during the Exam are concerned, you may have read a number of different stories from other posters here - and whether you would receive additional time on your clock when facing that type of issue often comes down to the 'severity' of the technical problem (in simple terms, the larger the issue/delay, the greater the likelihood of receiving that extra time 'added back' to your clock). Since the At-home GMAT is offered almost every day (and at any time of day), you could potentially book your appointment on the same day that you take the Exam (assuming that a spot is available and your payment is automatic).
A little over a month ago, you reported that you had scored 640 on the Official GMAT - and that you were unhappy with your result. You didn't provide any other details about your studies though - and if you've gotten "stuck" at this particular level, then you might not want to rush in to take the At-home GMAT just yet. To define how close you might be to hitting your 720+ Score Goal, it would help if you could provide a bit more information on how you've been studying and your goals:
1) What were your Quant and Verbal Scaled Scores for your 640? Was this the only time you've taken the Official GMAT?
2) How long have you studied? How many hours do you typically study each week?
3) What study materials have you used so far? What “brands” of CATs/mocks have you used?
4) On what dates (or approximate dates) did you take EACH of your CATs/mocks and how did you score on EACH (including the Quant and Verbal Scaled Scores for EACH)?
5) When are you planning to apply to Business School and what Schools are you planning to apply to?
If you took your Official GMAT at a Test Center, then you might also choose to purchase the Enhanced Score Report. While the ESR doesn’t provide a lot of information, there are usually a few data points that we can use to define what went wrong on Test Day (and what you should work on to score higher). If you purchase the ESR, then I'll be happy to analyze it for you.
GMAT assassins aren't born, they're made,
Rich