UPES

It is good. It's placements is also very good. It does't have much students so competition is less but you will be placed will good package.

For computer Science engineering I will prefer UPES. For automobile engineering I don't have much idea. In UPES CS branch get good placements. If you are above average student then you will get good package in UPES.

VIT and UPES both are very good colleges. Both have good placements. Some of my friends are in VIT. They are getting good education and I am studying in UPES. I didn't give exam for VIT. Because I prefer UPES more than VIT. According to me, Education system in UPES is better.

I don't have much idea about LAW in Amity Noida. But in UPES study pattern is quite good. I can't say much about the placements. Some students get good placements some go to reputated law firm with low packages.

It is on rank 3rd for petroleum engineering all over India. In terms of placements, petrology gets the highest placements here.
For CS, there are 17 specialisations you can choose.
CS branches also gets good placements. Top recruiters are IBM, LNT, Microsoft, VMware, Dell, etc.
The highest package for petroleum was around 27 LPA last year. And it was 17 or 18 LPA for CS.

For CS, its ranking is not that good. But for petroleum engineering, its ranking is 3rd all over India. Still, CS branch gets good placements in UPES.
But at last, it's up to you.

Among these colleges I will prefer UPES for you in terms of placements and study. You can check placements on their official websites.

I will prefer IPES. It placements are good as comparison to others. And study is also well mannered.

I don't have any idea about IPU.
If your son has 112 marks in JEE having general category, then he might not get any good NITs easily.
He can go for other private colleges.

Counselling is starting from 31 may. So there are very less chances that you will get petroleum branch. There are only 20-25% chances for getting petroleum engineering. But you can try for it.