Greetings for the day!
I also work in a recruitment company and getting hold of a fresher is not so difficult.
1- Naukri portal is one of the best job portal to get hold of any candidate irrespective of his years of experience.
2- Monster, Shine, Indeed, Olx etc. are some of the job portals to find freshers.
3- LinkedIn is also one of the best way to reach them out as i personally believe that students who are out of college will have Facebook, Twitter and LinkedIn as basic social media apps in their mobile.
4- Campus drive is one the easiest way as it is free of cost and placement officer in college will also be privileged that his candidates would somehow be placed.