Hello, 

Being a graduate in commerce you're eligible to apply for all posts in SSC CGL exams. 

Even, for posts like AAO and Junior Statistical officer, people from commerce background will find it comparatively easier as they already have acquired required knowledge in this domain. 

Although the eligibility criteria for this exam is bachelor's degree from any recognized university, specifically for the above mentioned exams one needs to qualify certain papers. 

Hope, this helps