Hi Minisha

The GK section of any Mass Communication test, broadly have questions from sections like, 

• Politics
• History
• Economics
• Geography
• Science and other current affairs

The best ways to prepare for the GK section is to read newspapers, basically keep yourself abreast with all the recent happenings around the world. Also read about sports, technology, Arts etc. Just to add on, also make a habit of reading the Editorial section of a newspaper, this will help you improvise your language skills, which is always helpful. 

You can also prepare from GK books like, 

1. Pearson GK 

2. Arihant General Studies

3. Lucent's GK

4 Mc Graw Hill GK

These are some of the good GK books that will be helpful with your GK preparations. All the best!