Talend Associate Technical Support Engineer interview questions

First it was a general talk about skills and experience with the hr which went really good . Next, technical round was set and questions were related to core java topics and also puzzles . The interviewer was very good and made me feel comfortable . I also recieved a very good feedback for doing well. The first question the hiring manager asked me was why my PU marks were low . I haven't seen any hiring manager ask this in any interview till date . I have maintained an overall score of first class (60-70%) thought my academics and it is a decent score . I was never asked any technical aspects or skills related to the job . Few situational questions were asked and I answered really good using the Listen , Apology , Resolution along with STAR technique but still he wasn't happy with it is what I felt .