You can get a job either from campus placement or you have to apply outside campus. Every year there are many job openings in  different fields so make your resume and look out for different job openings  either online like different job portal websites or go to the company's official website and look out for any job openings currently .
The better way is to apply at different job portals websites as they will give you a list  of what type of company do you want to join and apply for.
Make your you have an updated resume with you and keep a copy of your marksheets in case you require.