VBA Macro (Changing Cells From A1-C3 Then A2-C2)

What my code needs to do: It needs to verify data in column rows say for this example columns A to C and infinite rows. It needs to verify the data in this order A1, B1, C1, A2, B2, C3 etc. (One of the part I have problems to do) It also needs to add to a row/cell "1" when certain conditions. (In the same line as the last checked data in the column "D" say for exemple last data that was checked is "A3" well the 1 must be written in "D3". The conditions are simple the first Data the macro encounters must be higher than 0.25 and all following data must be higher than 6, whenever the next data is lower than 6 or empty add 1 to the corresponding D row and restart at the 0.25 cell "checking".