That simply means that the examination will commence 2 weeks after the end of registration.
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You can consult the how to register Jamb 2017 for the detailed registration procedures.
For candidates who usually wait till after the registration to start preparing for examination, I believe by now you already know it’s not going to favour you this time.
So your best option is to start studying seriously and if you have been doing that already, well done!
WHAT ELSE DO YOU WANT?