There have been many questions about combining rewards, so here’s a quick and simple guide to help.
The test net has 2 phases, and each phase has 2 tiers, meaning there are 4 rewards in total:
Phase 1, Tier 1 (already distributed)
Phase 1, Tier 2 (already distributed)
Phase 2, Tier 1 (not released yet)
Phase 2, Tier 2 (not released yet)
Each on its own gives you an allocation. However, if you combine specific of the same tier, you get a higher allocation.
Phase 1, Tier 1 + Phase 2, Tier 1 = Gold, Tier 1 (higher allocation)
Phase 1, Tier 2 + Phase 2, Tier 2 = Silver, Tier 2 (higher allocation)
Tiers must match for a combination to work (Tier 1 with Tier 1 or Tier 2 with Tier 2).
Phases must be different (you can’t combine two from the same phase).
Each reward gives an allocation on its own, but combining gives an extra allocation.
User A has Phase 1, Tier 2 and Phase 2, Tier 1. They will get one Tier 1 and one Tier 2 allocation (no combination, so no extra allocation).
User B has Phase 1, Tier 1 and Phase 2, Tier 1. They can combine them to get a Gold NFT (2 Tier 1 allocations + extra).
User C has Phase 1, Tier 2 and two Phase 2, Tier 2s. They can combine Phase 1, Tier 2 with one Phase 2, Tier 2 to get a Silver (2 Tier 2 + extra), while the other Phase 2, Tier 2 remains uncombined. So the total allocation will be (2 Tier 2 + extra) + 1 Tier 2 allocation since the user has 3 Tier 2 allocation in total.

