Hi,

For me, what works is:
- knowing that the GMAT is just a means to an end. 3 hours and your out.
- think of all the effort, money, energies, time, all for a good score.
- focus. be here now. tell yourself this.
- small tricks. breathe deeply when you get a tough RC and get back to it. mini 10 second breaks can get you back in shape.
- during practice start developing focus and stamina.
- take many many mock tests simulation of experience in different times, places, and with different conditions (coffee vs tea, sleep 8 hours vs go out last night) (this is the best way)
- as you progress, if you start low, improvement shows a sign of satisfaction. improvement = its worth it to be devoting this time for this test.
- look forward to an activity post test (short term) - evening dinner for example.
- the MBA- your doing all of this to be accepted into one of the best schools in the world to obtain one of the most prestigious degrees and be selected to be part of an elite group. (i might be inflating things a bit, but tell yourself this)
- I love quant attitude. break down every problem into Polya's four step - understand problem, devise a plan, carry plan, look back.
- I love grammar attitude and I love reasoning and questioning assumptions attitude.
- practice enough that you could do it in your sleep, yawning, itching, scratching your balls, even if you took a 10 minute mid-break. (I am not at this stage at all but just a suggestion)
- motivation is key I guess.

Hope this helps.
Jas