Certificate course in Graphic Design

As I have Interest in Graphics. Can any suggest me some certificate courses and their duration in the field of Graphic Designing?

Their are many certificate course offered by the many governmental and non-governmental institutions:

Name of the Course	Course Duration
Certificate course in Computer Animation and Graphics	1 Year
Intermediate Graphic and web	6 Month
Designing Software - AutoCAD 2D and 3D	2 Month
Designing Software - 3Ds Max	5 Month
Certificate course in 3D Modeling and Animation	6 Month - 1 Year
Certificate in Graphic and Communication Design	1 Year