In the ranking of a competitive examination Vishal was above Vijay but below Shyam. Mohan was above Shyam but below Rohan. Vijay was between Vishal and Ashok. Who is third from the top ?
Shyam
Take each clue and write it as a chain, using "above" to mean nearer the top of the ranking.
"Vishal was above Vijay but below Shyam" gives Shyam > Vishal > Vijay.
"Mohan was above Shyam but below Rohan" gives Rohan > Mohan > Shyam. Since Shyam appears in both chains, they join at Shyam to give Rohan > Mohan > Shyam > Vishal > Vijay.
"Vijay was between Vishal and Ashok" places Ashok on the far side of Vijay from Vishal. Vishal is already above Vijay, so Ashok must be below him, giving Vishal > Vijay > Ashok.
Combining all three, the full order from top to bottom is Rohan, Mohan, Shyam, Vishal, Vijay, Ashok.
Counting down from the top, Rohan is first, Mohan is second and Shyam is third.
Hence the person third from the top is Shyam.
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