He will be exercising to lose weight. Needs to be able to squeeze out from toilet windows.
Next do some jungle survival. Eat, sleep, living it rough in the wild. He must be busy burying supplies at strategic locations now. Camouflage and change of clothes. Setup bank accounts in countries that will be in transit.
Then get some good swimming lessons. Ideally be able to swim across a patch of water maybe 500 to 1000m wide.
Lastly get in touch with the NIA. Get to know his handlers and set up and memorize passwords, numbers and/or safehouses. They will supply the secure satellite phones.
Now got to think how to shake off his tail in this tiny island