IET Lucknow does not accept JEE Main score for their admission process. You must have a valid score in UPSEE to get a seat.

In case you have not applied for UPSEE then you can try for HBTU Kanpur or Madan Mohan Malviya University of Technology (MMMUT), Gorakhpur. These colleges are almost at the same level as IET Lucknow and JEE Main scores are accepted here for admission. 

MMMUT also conducts its own entrance exam i.e. MET exam and some seats are reserved for JEE Main candidates. 

My friend is an alumnus of IET Lucknow and according to him, with a rank of 5915, it will be hard to get Chemical Engineering. In his year, only a few general category students received Chemical in the fifth round with a general rank greater than 6k.

However, because the scenario changes every year, there is no certainty that you will get it. Also, given HBTI's split from UPSEE, getting into IET with this rank appears to be extremely difficult. It's all a matter of luck. 

According to the cutoff trends in recent years, the required cutoff for the Chemical branch is 2856 for General Category.

The best part about IET Lucknow is the freedom it offers to the students. The college does not intend to restrict students to only academics. There is no pressure for attendance. However, some faculties might give weightage to attendance. So, if you can balance the academics and extracurricular, you can negotiate with them. Never give a chance to your teachers to point down your mistakes. 

Consider the below-mentioned points for this.

• Decent grades and marks in the sessional tests can save you.
• The faculties consider assignments too. So, make sure to submit your quality assignment adhering to all the instructions before deadlines. There is no need for more pages.
• Be enthusiastic and noticeable in classes by raising questions or giving answers to the teachers. Also, respect your teachers.
• Try to attend the lectures by the permanent faculties as such lectures are rare. There are only a few such faculties in the college. But they have vast experience and knowledge.
• Some students fill the attendance by themselves as soon as the faculty leaves the register in the class. But it is risky, and there is a probability of getting caught.
• Lab lectures are easy to skip. You can mark your attendance and leave the lab.

Overall, the classes are skippable in IET Lucknow if you have a decent image in front of faculties. Currently, compulsory attendance of 60% as per the rules of the new director is required, but 50% attendance will let you sit in exams.

One of the most important steps to change your branch would be scoring the highest in your first-year end semester. 

• Before 2020, if you were able to obtain 77% or above then you would definitely have had a chance to change your branch to a better branch such as CS. 
• Usually, students switched their branches from EI and Chemical to Computer Science, Mechanical or Electrical.
• But now if your score is above 8.5 SGPA at the end of your first semester then you are highly likely to gain the opportunity of changing your branch. If a seat is empty for the category of your preferred branch. 
• If you are the kind of student who studies every day with dedication and does not procrastinate until the exam comes, then it would be easy for you to score above 8.5 in your first year. 

Although branch change after the first year hardly takes place you can always give it a try and take a step closer to your goal.

I can give you some information on both institutes since I have friends from both IET Lucknow and JSS Noida. Based on the reviews that I got from my friends I will say choosing JSS Noida will be better. It has a locational advantage, which plays a crucial role.

• The curriculum of JSS Noida is in accordance with the current industry trends. In the first two semesters, you will learn the same courses as any other engineering institutes in India. You can get the detailed syllabus from the website.
• JSS has a good reputation in the industry. Alumni of the institute are working on Google, Microsoft, etc. Many reputed companies visit the campus for the placement drive including IBM, Wipro, TCS, Amazon, etc.

For IET, the location is an issue. The faculty and curriculum are not that great either. So, I will suggest you choose JSS Noida.

Students from different states do enroll at IET Lucknow because getting admission particularly depends upon the rank in the UPSEE exam. Depending upon whether or not you have secured a good rank, IET Lucknow accepts admission. 

However, only 15% of seats are for students outside of Uttar Pradesh, which typically means, 85% of the seats are reserved for Uttar Pradesh students solely. 

You will require a rank below 1000 if you are from the state of Uttar Pradesh, and a rank under 500 if you are from some other state to get into IET, Lucknow. 

You will find more information regarding admission on the official website.