Engineering

UK can do part time work as well as study also.

Yes, it is easy to get in you just need to have any of the course from below:
BE / B.Tech in Civil/ Geo Informatics/ CSE/ ECE/ EEE/ Agriculture engineering/ Urban & Regional Planning/ IT (or) B.Sc. , Agriculture/ Forestry/ Horticulture (4 years) (or) M.Sc. , Geology/ Applied Geology/ Geo Physics/ Geography/ Geo Informatics/ Physics/ Maths/ Oceanography/ Environmental Science and Equivalent degree.

Date is not out.

It is not justified. It depending upon the decisions of university.

It depends on your rank, category, home state and many other factors like choice preference, college and branch selection etc.

General rank is upto INR. 35,000

Well,It is totally based on your interest if you are a PCM student. You have a lot of ways and many paths to choose, you get to choose the one right for you. You can go with Engineering, or B.Sc of your subject choice or you can go with management courses like BBA or you can even go with some other degree courses in different stream. It is like what you want to be when you grow up and the main thing is what makes you happy.

Both have their own way of scope and future. If it's CSE you have sit in a place code. But, if you are an Automobile Engineer, you might work with Designing, hardware working, controlling various machines, monitoring and much more. It's totally based on your interest which one to go with.

With INR. 1 lakh rank, it's not possible to get admission in CS or IT in NITs. If your son wants to pursue only CS, it is better to go with some private institutes which accept JEE Score.