Comission/brokerage income

Dear Friends,

My income is from brokerage after deducting the TDS. Kindly clear my below mentioned points. 

1. Is it necessary to file a return as the income does not exceed the Taxable Limit ?

2. If so, Which form should be used?

3. Can i claim for refund, the tax which has been already deducted?

Note: - (No other income, Having Form 16A, Annual Brokerage income is Rs 120000)

Kindly assist friends