Computer Science and Engineering

20k to 40k is the cut-off for CSE under ComedK.

There is a link below that will redirect you to a page where you can find out the expected cut off for the colleges that you might get into with JEE score:
https://shiksha.com/b-tech/resources/jee-mains-college-predictor

Yes, you should go for IPU counseling. You will definitely get computer science engineering in a decent college of IPU.
Your rank is under the cut-off for admission in CSE.
So without any panic, go for IPU counseling.

In CS, one can learn to develop software and IT training of applications of software. For opportunities in US, CS is better and in India, IT and CS are equal.

TIT is a better college if you really want to learn something, as well as the faculty of this college is good, but one thing which is more famous about it is its discipline and the management is working like a school, it is so much strict, as you have to enter and exit at proper time between it you

Sorry to say but your rank is too high for computer science and IT cut-off.
If your rank had been under 800, then there were chances of getting CSE and under 1200, you might get IT but at this rank it is very difficult to grab these two branches.
I hope you understand my point.

At this rank, go for colleges like:
JSS
KIET
Galgotias
Gl Bajaj
ABES
AK Garg Engineering College
IMS Engineering College
IPEC
NIET
All the best.

See for coding purpose, Macbook is considered a good laptop. You can do coding on it. Other than that, you can buy any other laptop with a good configuration. For coding purposes, I would suggest you Linux/Ubuntu.
Best of luck.