Placements. The nightmare of all Engineering students! Be it Cse or Electronics or Mechanical, all face the same difficulties. At the time when we face the exams all are treated and given same opportunities. Sometimes you will feel biased like if IT companies come they ask coding related questions more which are not your field. But you can't help it. The no. of IT companies coming are much more than core companies. If you want tk do well, follow some guildeline 

• Practice aptitude as much as you can. 
• Learn C and Data structure
• Be thorough with one coding language (C, C++, or Java)
• Be strong on your core subjects
• Be confident, not overconfident.
• Never loose hope.

Companies have eligibility criteria based on CGPA. Mostly having CGPA 6 or above then you are allowed to sit for the test. But this varies from company to company.

Best of luck for the placements!