Hey,

SSC CGL is one of the biggest examinations conducted for graduate students. It's conducted by SSC every year to recruit staffs for different posts in the various ministries and departments of Government of India and the subordinate offices. 

There's no interview for SSC CGL. Instead you will have a four tiered examination which includes the medical test.

For the first level it's the preliminary examination where everyone can participate. The shortlisted candidates are then selected for level 2 or the mains examination. This is an objective type test passing which leads to level 3. This is the skill test which is descriptive . Document verification is also done. Lastly on Passing this level, the candidate can select the different posts he is eligible for  followed by medical tests which includes height, weight, vision , walking, cycling etc.

So you need not worry about any interview. You will have a medical test. All you need to do is focus on the written examinations.

All the best :)