2 ears.
1 mouth.
Use in direct proportion.
But back to the RT test. I shall not call it an exam. A test relates to current capability. An examination relates to retained knowledge.
To attain capability there is one very simple thing you need to do. (caps) PRACTICE.
Go for a gentle run around the block and chant to yourself
1) Mayday calls
2) First contact on Approach frequency.
3) Airways calls. You'll probably never need them, but they are in the test.
and again
and again.
When bored, chuck in an IFREFA or BUMCFFGGHHH. Then start again.
And do it out loud. I do this when jogging because that way I'm under similar stress levels as in the cockpit. If you happen to end up getting fit, just run faster.