You can either 1,chose to follow examples of fellow forumers, they all gave very good advice for you.
Or 2, chose to , like me, gave up the Skull Mask and play as I like. **bleep**, so much more fun.
FYI, the Healing can chose up to 6 tiers, even till the max tier, it's easy to complete (I think it's max 45 heals). The rest can also get repeated till the 6th tier but keep in mind, those like downs and executions on tier 6 can screw you with just 1 match.
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