SimCentric Technologies Intern - Software Engineer interview questions

There are 2 technical interviews and an HR interview, and all of interviews are online.HR interview is 10-15 min interview, but 1st technical interview is little bit difficult , they gave me scenario and draw system diagram , after that that scenario has developed step by step , they told implement this and if you insert this ,what will be the output , like wise they ask question , in this case , they check our oop concept, they mainly check it , not only theory knowledge but also practical knowledge also they check ,if you got an interview , refer oop concept as expert level.my 1st technical interview is closely 2 hours and 2nd interview is less than 1 hour.