How much can i save on a salary of 7k per month in singapore?

Hi,
i am planning to work in Singapore on a offer of 7k /month.
I am single can go for shared accommodation.
1. can anyone tell me how much tax will be cut for my salary for a first timer and how much would be the rentals in Singapore?
2. I want to save around 3.5 k per month is it possible in this salary?

How much you can save depends largely on your lifestyle and spending habits, which nobody here can predict. It is possible to save the amount you mention, but also to spend all the income and still want more.
You can find more information about cost of living on numbeo.com and the tax rates at iras.gov.sg. A sublet room (with or without own bath and use of shared kitchen) will cost you S$800-1500/month.