Balance Capital Goods ITC Claim

we are purchased capital good in FY 2017 18 total ITC AVAILABLE Approx 4.5 lack claim above amount 25% in F.y 2017-18 again 25% claim in f.y.2018-19 kindly guide me above 25% Claim f.y 2018 + 19 is strating month or Closing month

kindly guide me