Right on vs right about vs Right in

1.I think you are right on the point.

2.I think you are right about the point.

3.I think you are right in the point.

4.I think you are right on saying so.

5.I think you are right about saying so.

6.I think you are right in saying so.

I wonder what are correct English and about the differences in meaning.

I think only 1, 2, 6 are correct English and 1,2 mean almost the same, but 1 is not common.

Am I right?