Will I be able to work professionally in the Graphics field after obtaining YAT professional diplomas?

Absolutely yes, you will be able to do so, as reaching the technical proficiency level at what you will be trained on will, indeed, assist you in manifesting the best performance in this career.

Does YAT Professional Diploma guarantee getting a proper job for me?

Technically and practically speaking, yes…This diploma guarantees your specialty in comparison to others; due to good preparation and practice benefits for all who join this diploma, and thus it guarantees a good career opportunity.