They teach **** in the name of Computer Science..
But since you asked..
The first year is all about Science..Physics, Chem, Maths stuff...they will teach you C or C++
Second year is about Maths more on C and C++ including Data Structures...and also Electrical and Mechanical subjects...
Third year is all about Computer Science..they will teach you Java, Networking, Algorithms, Computer architecture and stuff
Fourth year is the same...Artificial Intelligence, Design Algorithms, Software Testing and the likes...
Mind you that, sans few, the teachers don't know **** about teaching...they are there to do their jobs and give you marks...
I would seriously suggest you doing prep on your own along with the college studies...if you like programming then you have to carefully plan out and learn most of the coding languages out there..start with C, C++..move onto Java, Ruby and if you want Python...C# is another good language...also learn video editing, basic 2D, 3D designing and you might get better at movie making(3D)...all these skills combined with your intellect and creativity will, definitely, do wonders for your career as a future game designer..and even if you don't get into game development these skills will open a whole lot of options for you...
4 years is a lot of time to learn the art..after which you will not get the time to get into it and learn all that stuff....so if you can, take interest and learn all that stuff while completing your B.Tech...Good Luck