Vinay Ji,
Total number of platforms at Mau are 3 only.
Earlier,...
more... it was 4 as pf 2 had the capacity to hold 2 trains(so it was considered as 2 and 3) at once bcoz of scissor crossing.
The scissor crossing has now been removed and pf 2 can't hold 2 trains at once.
Officially, it's been 3 only. It's just that, they have not removed sign board yet