Online test consisted of two sections, first was Aptitude section and the other consisted questions of SQL. In the aptitude section, the number of questions are more and time is somewhat less, starting few questions were time consuming so selection of questions to be solved is the key in this section.
As my interviewer was also from ECE background most of the questions asked were regarding the projects and skills i had written on my CV. Most of the questions asked to me were guesstimate questions but unlike general guesstimate questions these were technical based so its important to have a good knowledge of what you've written on your CV. After this round some students were directly selected and some were asked to appear for second round.
Personally i feel your communication skills are very important for any company , so be confident and try to smile during the interview :)