Psychometry is computer based with no time limit. Before you take the test, you will be advised to answer only those which you are comfortable with. I have no idea why the capt said this. I'm sure not answering a particular question would amount to negative points in their assessment.
There is no personal interview with SG. Once you clear all the rounds, you're basically in. That is if they hire as many as they advertise, that is. SG is notorious for making changes to the test format on the go, so don't be surprised if unexpected things pop up during/after the tests.