There is no shortcut to mastering the section of GK-CA.
Understand the type of questions that appear in your entrance exam by looking at the past papers of the exam. Develop extensive reading habits. You can use commercially available books to prepare for GK and freely available websites and mobile applications to regularly access and read up on Current Affairs.
The syllabus for GK-CA is vast and ever changing. The student who regularly and religiously reads up on current affairs is the one who is going to great in this section.