1- first you defined your Treemap but you didn't put entries of Hashmap in it.
s.putAll(m);
2- second in your comparator
you should have compared the map's values getting them thought your key so it can iterate on all values of the map.
The code now prints:
Charu=68
Mohan=89
Angit=10
{Angit=10, Charu=68, Mohan=89} -----> after sorting