Like most of the others have said:

1. Good pregame - if there is enough time you may have a feeling for what your partner may be like before you step on the floor

2. Discuss when you can during the game (timeouts, halftime...)

3. Expand your area to help out - don't make all the calls make the necessary ones.

4. Don't overrule your partner - bring them information (if you saw it the other way) and let them change it. Help them keep calm.

5. Post game - discuss with them how they feel about the game. Do they have any questions. It won't help with the current game but it can help them improve for the next one.

Good luck with the next ones.