Yes there are are many sites on the net which provide facility for Graduate Record Examination (GRE) coaching but as you are Indian so I would like to say

There are two kinds of institutions offering online GRE courses coaching in India.

Type 1 : The international ones like

1) Magoosh (80 to 100 USD which works out to Rs.5200 to Rs.6600)

2) Kaplan (Rs. 35000 to Rs. 45000)

Type 2: The Indian ones like

1) GRE edge (Priced at around Rs.5000 to Rs.16000)

2) Non specialists like Careerlauncher etc. who also charge somewhere in excess of Rs.6000

List of GRE Coaching in Hyderabad

Stanford Review, K.P.H.B. Colony
91 40 30161640
401,Above Punjab National Bank,beside Prasad hospital,Road No 1, K.P.H.B. Colony, Hyderabad – 500072

IMS Learning Resources Pvt. Ltd., Begumpet
91 40 33139281
3rd Floor, Bri Tarangj, Begumpet, Hyderabad – 500016

IELTS Guru, Ameerpet
91 40 33584527
No. G2, Ratna Complex, Ameerpet, Hyderabad – 500038

Visu Academy Ltd., Saifabad
91 40 33584545
G-03, Mount Nasir Apartment, Saifabad, Hyderabad – 500004

Global Recruitment & Training Consultants - GRTC, Kukatpally
91 40 33153484
LIG-648, 1st Floor, Road No. 5, K.P.H.B Colony, Kukatpally, Hyderabad – 500072

People's Career, Lakdi Ka Pul
91 40 33695644
Flat No. 3, 1st Floor, Door No. 6-2-30/C3, Ortho Care Building, Lakdi Ka Pul, Hyderabad - 500004