Best coaching centers for UGC NET/SET exams? Is classroom coaching essential for these exams? Is it possible to get good marks without classroom coaching?

Respected sir/madam,
This is abirami from thanjavur. i have completed M.A., B.ED.,(ENGLISH)., M.B.A.,I wish to write ugc net/set exams. i like to pass in the forthcoming set exam.. i have collected some materials regarding paper 1.. but i couldn't get more materials for paper 2&3(english). so i need to know the best coaching centres for set/net within tamilnadu inorder to get effective materials.

Is classroom teaching is essential for these exams??? can i get more marks without classroom teaching?? sir, i need ur valuable guidance regarding these exams and also give me some study tips..
one more question to u sir- where to get study materials for DEO exams.. is there any seperate coaching centres in chennai and trichy?.
Thanks & regards,
S.ABIRAMI.