First of all Congratulations Sir that your Ward got good rank in A.E.E.E. As his result is very Good then surely he will get Computer Science Branch at Amrita University Coimbatore. Last year's i.e. in 2019 the closing rank of  Computer Science Branch is 6960 for the open quota and 16507 in the state quota. Hence it is assured that he He will easily got Computer Science Branch in Amrita University Coimbatore.

Congratulations Sir