1) For reverse graduation haircut, we will first give our client a U-shaped haircut.
2) Once client is given a proper U-shaped haircut, comb out clients hair properly and spread out hair on the sides and back properly.
3) Now starting from the center of the back take a vertical section and take it at 90 degree. Now keeping the U shape (that we have already cut) as a guideline cut the hair at 90 degree.
4) Start with one side, keep taking vertical sections and cut at 90 degree. Remember that this time the guideline is the U-shaped hair that we have already cut ( and not the hair from the center of the back)