Sir, if composition scheme is not valid for contractor how can they make return?

Maintaining digital records will be mandatory, as online filing of monthly ITR will be needed. Can borrow professional services.......

Sir, whether contractor can avail to get ITC if he purchase material both from intra -state and inter -state.

Yes, but under normal scheme. As ITC cannot be availed by composition traders.

Some other compliance also required to be checked, like output services to be taxable with ITC (it should not be tax-exempt)