Hi, my personal exp :
1. For Verbal : u can get in touch with Crackverbal if u r from India ( though they conduct both live as well as online sessions ). The founder n instructor Arun is magical. He is active on this forum, u can search arun@crackverbal n drop a pm :
2. For Quant : u can get in touch with the quant guru Ian Stewart who conducts sessions over skype@ a very nominal rate..... Guess he doesn't need any credentials ; he is active on both gmatclub / btg , search n drop a pm.
Speak / understand/ share ur expectations ---- (They both are extremely candid / responsive and knows gmat in n out) before zoning in.