Absolutely, but you must live eat, breathe, and shit GMAT.
For example, let's say you just spent one month answering all of the OG 10 Questions (1458), Kaplan 800, and one other book of your choice.
You spent about 30 days answering at least 100 questions per day of varying difficulty and then reviewed all of the questions you got wrong.
Then when this is done, you have your GMAT Hell Week and then you become a GMAT test taking machine.
Every day you take 3 tests. That's 234 questions a day. All timed. One in the morning when you wake up.
Schedule is like this. Wake up : eat breakfast, take first test, review.
Go for a 30 minute walk after. Spend 1 hour watching TV, reading, relaxing, take a nap etc.
Take 2nd test, review. Eat lunch or early dinner. Watch TV 1 hour.
Take 3rd test, review. Eat dinner, shower, pleasure yourself, watch porn, read book, call your friend, take a nap.
You will spend 7.5 hours a day taking tests and then reviewing your mistakes in between. But follow this schedule for a week.
If you have a job, take a week off to do the aforementionned. By the 8th day and the day you take the test, you will be in "TEST TAKING MODE"
On the night of the fifth day, it might be a good idea to buy a 12 pack of your favorite beer, a bottle of wine, a pack of Camel lights if you smoke and get completely blitzkrieged. Hookers are optional.
I feel that an intermittent night leading up to the test (but definitely not the night before the exam at least 2 days before the exam) will help you calm your nerves, let out the stress, and make you perform better on the real test.
Follow this routine and you will become a GMAT Terminator. I didn't get quite the score wanted with this routine (my target is pretty high) but I got pretty close and I know that I would just have to do the above one more time and I will achieve target.
Impossible is nothing