Who among them scored highest in Maths?
Amit
From the given data.
As Ajit and Dinesh belong to same group, their last statements cannot be simultaneously true.
Hence, their 2nd statements must be true.
Similarly, Bijay and Amit's second statements are false.
The final table
MathsScienceEnglish1stAmitDineshDeepak2ndDineshBijayAmit3rdDeepakAjitDinesh4thAjitDeepakBijay5thBijayAmitAjit