Hi samedesh,
From what you've described, your current study routine is essentially focused on 'cramming' during the weekends. Unfortunately, that type of approach rarely leads to big score improvements on the GMAT. You'll be far more likely to earn that higher score if you could break your studies down into small 'chunks' throughout the week (and while you can still study for longer periods of time on the weekends, you would almost certainly have to study for more than 1 hour a day during the week). If you cannot make that adjustment to your routine, then there might be a limit to how high you can score on the GMAT.
Beyond doing lots of practice problems, you will likely need consistent, professional guidance so that you can learn all of the patterns, tactics and 'secrets' of the GMAT (without having to try to figure out all of that stuff on your own). As such, you would likely find it beneficial to invest in a GMAT Course of some kind (either Guided Self-Study or Instructor-Led). Most GMAT Companies offer some type of free materials (practice problems, Trial Accounts, videos, etc.) that you can use to 'test out' a product before you buy it. We have a variety of those resources at our site (
www.empowergmat.com). I suggest that you take advantage of all of them then choose the one that best matches your personality, timeline and budget.
GMAT assassins aren't born, they're made,
Rich