I would like to visit "Kailash Manasarover" Tibet, China. What are the documents are required to be submitted along with Visa application forms?

You can't travel to Tibet individually.

Holders of Indian ordinary passports wishing to travel to Tibet in China may join, the tour organizer will help you to get a tourist visa to China

A. Pilgrimage Group: Group of pilgrims is organized by Ministry of External Affairs, Government of India and authorized Indian travel agencies. The Embassy accepts visa applications of pilgrimage groups submitted by the Ministry of External Affairs and authorized Indian travel agencies only.

B. Ordinary Tourist Group: Tourist group of Indian nationals can be organized by local Indian travel agency with arrangements from CITS Tibet (China International Travel Service, Tibet). Group visa may be issued only after the Embassy has received approval from Tourism Bureau of Tibetan Autonomous Region.