Engineering

As your upcey is under following category then following is the best choice. Top 4000 to 5000
For general category in any NIT, and for top NITs needs 3 digit rank atleast. Below 5k, it is hard to get CSE in any NIT (lower also), but can get after few rounds of JoSAA counselling.

Tech courses. The institute has an active placement cell that conducts placement drives every year. The placement cell also provides guidance to students for higher studies in India and Abroad. The fees range between INR 40000 to INR 45000.

Based on previous year cut off ranks you have chances to get a seat in GVPCE. As you didnt mentioned your category, I am asuming you as general category. Here are the previous year cut off ranks for different branches-
B.Tech Computer Science Engineering-20327
B.Tech Electronics & Communication Engineering-25275
B.Tech Information Technology-38404
B.Tech Electrical And Electronics Engineering-43396
Therefore you can get seat in ECE.

Yes, because placement wise NEC is a promising college among other colleges in Tuticorin. Top MNCs like TCS, Zoho etc. Recruit from this college. The infrastructure of the college is mediocre in comparison to other colleges in Tuticorin, NEC is an optimal choice. No arts and Science college in Tuticorin has good placement so If you are aspiring to take up Arts and Science then it is better to opt for colleges in Chennai where you get better exposure.

Andhra University College of Engineering, Visakhapatnam
GVPCE Visakhapatnam - Gayatri Vidya Parishad College of Engineering
Aditya Engineering College, Surampalem
SVUCE Tirupati - Sri Venkateswara University College of Engineering.

You may go for
BITSAT
VITEEE
KIITEE
AIT
SRMJEE
COMEDK.

Hi, basically it requires minimum of 12th passed with 70% marks in commerce for getting admission in B.Com. Try consulting the targeted college and you will get admission in B.Com after doing Polytechnic mechanical engineering Diploma.

Hi,
As you know the competition is quite hard these days so with 2500 rank in IPU CET it is not possible for you to get the top colleges under IPU. But don't be sad you will get 2nd or 3rd best colleges under IPU.

Hi,
As you know the basic requirement for getting admission in further courses required a minimum of 60% marks so there are chances that you will be selected for IIMs. And don't worry universities always give strict marks.

It is a very good percentile, you easily get many nits with CSE branch. Its very hard to get NIT Rourkela. But, you can go for other. Apply for Jossa counselling to get such options.