Before you attend the interview i.e., during preparation for the interview for particular job, try to analyze what are the skills that are required for doing that job. And try to get some knowledge on that field as well as tools that you are going to use after you get that job

     If the time is very less to get all the skills, try at least to know the basics on the important skills and tools. Tools here referred to the software tools and hardware tools you are going to use on that job.

     Some of the important tools you should know while attending the interviews that are related to Computer science field are Netbeans, Eclipse, Android studio, Xampp etc. 

     You can get some basics about this tools in youtube. There are lot of videos in youtube which will give intro about these tools. I recommend you to prepare regularly from the first year itself, so that you will get confidence to speak about the tools during the interview. The last minute preparation will make you nervous and can make to forgot the things you prepare.