I cannot recommend MBA applicants to use all their vacations for their GMAT preparations, I understand that they have a family life and need to spend some time with them. But the MBA is a big commitment, especially if you are applying for the top programs and I would suggest that you do not underestimate that. Understand that that the more time you spend on your MBA the better the results, so it is a worthwhile investment.
Put time and effort into the preparations. It is tough. But the investment is worth the pain.
Another advice I’d give is to visit schools. Being based in Saudi Arabia I did not have the time to make the necessary visits because whatever little time I could get was spent on the GMAT and applications. Fortunately Dr. Hubert Silly, who travels a lot was able to guide me on the basis of his school visits. He is the one who convinced me to go for the MSc rather than an Executive MBA.
Finally, I met a wonderful team in Paris and got wonderful support from the MBA Center team. I am aware that without their support I would never be accepted to LBS and I strongly recommend that new applicants use their services while preparing for the MBA.