No need to withdraw, just don’t show up for test Or oath, eventually it will be treated as abandoning the application
Yes it will work.
However I would suggest that you tell them you want to withdraw and if possible with a reason.
I see several benefits:
* In case you want to apply again in the future, they will have trace of your first application. So better to show them that your treat the application seriously.
* It will save from processing time for other applicants. Some of them are waiting for a very long time for someone to continue processing their applications. If you just wait, they will send you two invites for the test or oath.
* You'll get your 100$ back faster.