It's difficult for me to say whether choosing IIT Guwahati CSE over IIT Varanasi CSE was a mistake without more information about your specific circumstances and goals. Both IIT Guwahati and IIT Varanasi are highly respected institutions, and both offer strong Computer Science programs that are rightly comparable in almost every aspect.

The placement scenario is similarly decent at both institutes with very little emphasis on research. The active Coding Club/ CSEA at IIT Guwahati gives it a slight edge over others. Both the institutes are excellent choices for whatever you want to do after graduation be it research, open source development, or a stable job.

The only distinguishing feature is the weather as IIT Guwahati has better weather conditions than IIT BHU. However, this flaw is compensated by better connectivity of Varanasi being on the mainland. 

NIT Surathkal is better than Delhi engineering colleges like NSIT, DTU and IIIT Delhi because it offers a more diverse experience. Here are a few aspects to consider

• Reputation : NIT Surathkal enjoys the status of being an Institute of National importance and is fully funded by the Central government whereas DTU, NSIT, and IIITD are state government universities
• Research culture: NIT Surathkal has a rich research culture and facilities and is one of the institutes which is selected for funding from HEFA
• Academics : NIT Surathkal is a clear winner as its academic environment and curriculum are way better than Delhi colleges. Every year many students win International awards.
• Campus life: NIT Surathkal has a private beach with a lush green campus of 300 acres. Moreover, its crowd is much more diverse than Delhi colleges which have 85% quota for Delhites. 
• Location : Situated near the IT hub, Bangalore NIT Surathkal students are exposed to more opportunities and a better IT environment. Many Bangalore IT companies give preference to NITK Surathkal students. 
• Placements : NIT Surathkal achieves 100% placement and has a better variety of recruiters than Delhi colleges. 
• Coding Culture: NIT Surathkal has received good rankings in the ICPC Asia Contest and every year many students are selected for Google Summer of Code.
• ROI : NIT Surathkal offers a better ROI because it charges lesser fees than NSIT, DTU, and IIIT Delhi. 

So, it's safe to say NIT Surathkal is a much better option than Delhi colleges. 

AMU is better than VIT, SRM, Manipal and Thapar in many respects. AMU offers top notch facilities like these private colleges, but its fees are way less in comparison. 

Here are the goods and bads of joining AMU-

1. AMU has very good placements for CS, Electronics and Electrical branches. 
2. The cost of study and hostels is extremely pocket friendly. 
3. The campus is great and very safe for girls.
4. The faculty and infrastructure are both top notch. The CS and Electronics teachers have worked in the past for MNCs like Cisco and Microsoft.
5. The library and book banks allow easy access to books for those who suffer from financial difficulties.
6. The core branches (civil, mechanical and chemical) do not get core placement offers on campus. But one who knows his/her subjects well and has a good CPI, can easily acquire a good core job off campus. Core branches usually receive software related jobs offers during campus placements. 
7. Some freshers might feel a cultural shock at AMU, but they’ll eventually adapt to their new environment. 

Aligarh Muslim University is a more reputable brand in comparison to private colleges, and its education is much more affordable. You must work hard and get a good rank to get admission into AMU.

There are several factors that you need to consider while making a choice. 

NIT Kurukshetra is definitely much more economical than Thapar. There was a time when Thapar was superior to NIT Kurukshetra. But with time, things have changed a lot for both the colleges. 

At NIT Kurukshetra, the teaching quality varies with departments. Most professors are very learned and supportive. The professors of ECE department are quite learned. However, they are also very strict with their students. The placements are good at both. You can check the placement scenario at Thapar and NIT Kurukshetra . 

NIT Kurukshetra and Thapar are both good colleges and have their own strengths and weaknesses.

Among these institutes, VIT Pune is better for CS. Academics, infrastructure, exposure, placements, internships, etc. are better at VIT. 

Companies like Amazon, Cognizant, Infosys, TCS, Accenture, Nvidia, Tata Power, Atlas Copco, etc. are some of the major recruiters that frequently visit the campus placements. In the last semester, there is a compulsory 6-month internship module at VIT. This helps a lot with placements. According to trends of the last few years, VIT Pune CSE average package is INR 6.34 LPA. During 2021 placements, the highest CTC offered was INR 33.75 LPA.

The choice of UPTU college for a B.Tech CS/IT course depends entirely on your priorities and preferences. Consider factors such as your preferred location, cost of living, city culture, security, placement opportunities, and most importantly, the quality of education offered by the college.

While the quality of education may be a factor to consider, remember that ultimately, your success in college will depend on your own dedication and effort. The atmosphere and culture of a college can have an impact, but it is not the only determining factor in making a college the "best" choice for you.

Based on these considerations, we recommend that you consider IMS Engineering College as your first choice, followed by NIET, and lastly G.L Bajaj.