Hi sidharth7510,
To start, many GMATers are unhappy with their initial practice scores, but you really shouldn't be. That 280 is just a measure of your skills right now - and you'll improve on that result over time as you learn more about the content, Tactics and little 'secrets' of the Exam.
From what you describe, you're going to have to make improvements to more than just your GMAT Score though. If your overall profile is 'weak' right now, then you'll need some time to properly strengthen it - and depending on the Schools that you plan to apply to, you might have to make some really specific improvements. This is meant to say that you would likely find it beneficial to speak with an Admissions Expert about your overall profile and plans. Those Experts should be able to answer your Admissions questions and help define the specific areas of your profile that could use some improvement. There's a Forum full of those Experts here:
https://gmatclub.com/forum/ask-admissio ... tants-124/I'd like to know a bit more about your timeline and goals:
1) What is your goal score?
2) When are you planning to take the GMAT?
3) When are you planning to apply to Business School and what Schools are you planning to apply to?
GMAT assassins aren't born, they're made,
Rich