I use alarm clock xtreme with lollipop on the S5. It doesn't make me unlock the phone to snooze it. I don't have it setup to do math problems though. Maybe there is some kind of difference in Samsung TW between the S5 and S6 that's causing your issue.
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Changing it to hide sensitive data will hide the content on the lock screen but not remove it from the lock screen. the op wants to see them only notification bar not the lock screen. And so do I.
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