I'm sure you realize there's no stock answer to your question. Some "weaker" partners can be very resentful of anything you try to do to help. Conversely, some are grateful for any help. I guess you just try to test them out at the beginning of the game the first time they don't perform up to par by diplomatically asking them about a call. Try not to "lecture" them, but try to phrase your help in the form of questions without being confrontational. Nod and say things like "I see" when they answer. Reply with suggestions in a friendly manner. Unless they're a real jerk (which, unfortunately, sometimes is the case) they probably will become more responsive as the game goes on. You know you've gotten through to them when they start to come to you for advice, however, if they tell you they don't want any, just accept that and do the best you can on your own.
Hope that helps at least a little. Just be patient and accept that you can't turn everyone around.
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Yom HaShoah
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