Hi Thomas,
There is nothing you 'need' to know. The Army will teach you everything you need to know as you move through each process of the application and moving forward into the training thereafter. If there is some advice to be given I would say to do some homework on roles that you would like to do using the Army Role Finder on the Army Jobs Website. Also make sure you scroll down on each role you like the idea of and check that you make the entry requirements with regards to your grades. This will help speed up the application process.
Warm Regards,
SSgt Rob Needham
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