So that - lest

So that - lest. (similarities and differencies)? What can go after so that? I have run into the following
1) modal verb 2) will (would) 3) main verb
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1) I am calling him so that he should (could) meet her
2) I am calling him so that he will meet her
3) I am calling him so that he woudl meet her
4) I am calling him so that he meets her

Does each of these sentences make sense or is there a wrong sentence?
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What can go after LEST?

1) Modal verb 2) would 3) infinitive
1) I am calling him lest he shoud meet her.
2) I am calling him lest he would meet her.
3) I am calling him lest he meet her,
Are all these correct?
Is it ok to use will after lest - lest he will meet her?

Thanks