How do I get 100% clash of zone rewards?

The 100 % tickets (that give you a 100% increase on the base points reward) can be exchanged from 50% tickets. You need 4 50% tickets to convert to 1 100% ticket. Or you can also earn 1 (or 2 with the right research) 100% tickets in the final (9th) reward box from each days CoZ.

You can earn a lot of 50% tickets each day if your alliance scores a lot of coz points and you can also earn a few reward boxes yourself.