Hello
According to your son's marks he have decent chances to enter for computer science engineering at university. The admission for engineering courses for colleges coming under Anna university is by TNEA ( Tamil Nadu engineering admission) ranks.
It's difficult to predict the exact college he will get into because the cutoffs changes every year based on the no.of students applied, seats available and their class 12 marks.
As per your query, CEG college had a cutoff of rank 77 previous year and MIT had a cutoff rank 444. By the way, ACTECH is not offering computer science Engineering.
Since TNEA has already released the ranks on September 23 , you can join colleges according to that.
You can use this link to predict your spot in colleges by TNEA rank:
TNEA College Predictor - Know your college admission chances based on ...
Hope this information is useful
Thanks
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