Nice that you have started placement preparation so early, you have great chance landing up in best companies that come to campus.
The first and foremost step is to decide which type of companies you want to get placed. I’m pretty sure you are looking to get placed in core product development companies like Microsoft, Amazon, De Shaw, Informatica etc.
My answer will be for these companies only, but I’m sure it will help in cracking other less-hard tech-interviews like that of Samsung, MAKE MY TRIPCUSTOMER CARE HELPLINE NUMBER 6297349601//8011813011 CUSTOMER SUPPORT Gjj, Winshuttle etc.
Many companies which come to college often places some cutoff criteria for the written round. Normally high paying companies which come early for placements put a criteria of 8CGPA. Since you are still in 3rd year, you have great chance to improve your CG in these 2-3 upcoming semester.
CS branch is very generous in giving grades in latter semesters, so keep attending classes or reading class notes which will help in improving your CGPA.
If you are 7.5+, try hard to make it 8+ in these remaining 2 semesters otherwise you will miss written round of some really good companies.