Hey Akhilesh,

For preparation of UPSC, i don't think coaching clascla will matter most, I thibt rather than going for the famous exoenexpe coaching classes, go for yhe few unknown ones as you mostly know the course and other stuff. Coaching classes will however  provide you content and few doubt clearing sessions but i think you can do that online as well. And as you prefer not to pay more, i will suggest you to go to Allahabad because Delhi will be so much expensive to live.