Hey there!
Well good sir, as you can probably guess, if your intention is to pursue an MBA, the most important thing is to keep working on that GMAT. 620 is pretty low for an MBA, and for a Chinese applicant, will be even more difficult. The good news is that you still have plenty of time to make it happen!
So get moving on that!
楼主我和你一样大龄,当时也是一样有小孩有家庭有工作,我的GMAT也不算高,2014年去加拿大念了MBA,你可以看看我之前写的一些心得,另外我的专业也是创业方向,在学校创业孵化器的帮助下在加拿大现在开了自己的公司,imposible is nothing,因此我给你的建议是大龄申请人的GMAT不需要小鲜肉申请人那么高(不过650也是必须的),可以用工作经历去弥补(当然申请美国top gmat的要求会比较高),祝你好运,也可以加我微信laomaimai1979我们交流