Gave my MOST today and passed. You will not find any resource on the web for MOST and that's the way the navy intends it to be. To give you an idea it is more advance than the CFAT. The only thing you would require for the test is mental math and attention to detail. Mind it - it's not an exam to test your math ability but it's more catered to test your mental fitness and the way you react to things when there is literally no time.
So trust your experience, if the recruitment centre asked you to write the MOST, you must have done fairly well in your CFAT and they believe you could pass MOST too. Do not get phased if you feel the test is not going well, take deep breaths and try to complete the exam with the best of your ability.
Definitely celebrate if you pass. Having a cold one on a Tuesday afternoon feels right
Best of luck to all my comrades.