How to do the mass revaluation ?

The client wants to revalue asset as at 31-March -2019 and already they have run the depreciation. Starting from April 2019 revaluation value should be in the asset books and continue the depreciation. 

If we do the revaluation for open period 31-mar-2019  it will calculate the depreciation twice?

Please tell us how to do the revaluation when they have different percentages (revaluation calculation percentages)? We need to do it one by or any other way to do it? as an example one category they have different revaluation rates?

And also they need to extend their new lifetime as below;

Orginal life year = 10 days