As you have asked about the best courses for computer science students in college, I am giving you information about it, check below for the details

There are many short term computer courses which are available for the computer science graduates,
You can choose the courses you wants to go for the jobs then you can take up those related courses of study
There are diploma computer courses are also available and also the short term courses

Some of the courses are:

Java
Oracle
DBMS
PHP
.Net
SAP
Multi media
Animations
Advance Java
Web designing
CCNA
Networking
C
C++
J2EE