B.Tech Computer Science and Engineering

Yes you can get admission in B.Tech in good colleges.
As you have low percentage, you can opt for private colleges like Sharda, amity, galgotia, Lpu etc.
They required atleast 45%.
which you already have.

Sorry, but you cannot join IIST which is Indian Institute of Space Science and Technology directly. If you wanna go for B.Tech CSE Course, you must have qualify for the Joint Entrance Examination and then you can apply for Indian Institute of Space Science and Technology. Wish you best of luck for your entrance exam if you gonna sit for it.

For admission to the B.Tech course, the expected Vishnu Institute of Technology Andhra Pradesh EAMCET cutoff 2024 is 5910 to 68290th rank for the general category students. Likewise, for the SC and ST categories, it is 32660 to 127630th rank and 52060 to 144720th rank, respectively.

it's possible to get a seat in Vishnu Institute of Technology (VIT) for a B.Tech in Computer Science and Engineering (CSE) with a rank between 45,000 and 50,000 in the Andhra Pradesh Engineering, Agriculture and Medical Common Entrance Test (AP EAMCET): 

Eligibility criteria to pursue CSE

For eligibility for a BTech in CSE, candidates must have passed the Class 12 exam from an accredited board with Physics, Chemistry, and Mathematics as their core courses. A minimum cumulative score of 60% in the aforementioned subjects is also required of candidates.

The cutoff ranks for the B.Tech in Computer Science and Engineering (CSE) at the University of Calcutta for the 2024 WBJEE Round 2 were between 634 and 4348 for the General AI category. The B.Tech in CSE was the most competitive course in this category. 

The B.Tech in Computer Science and Engineering (Artificial Intelligence and Machine Learning) at Neil Gogte Institute of Technology (NGIT) has an annual fee of INR 90,000. Additional special fees for a year include INR 5,500. There is also a one-time NBA accreditation fee of INR 3,000.

JEE Mains cut off for B.Tech at DDU, Gorakhpur for the OBC category is likely to be around a closing rank of 287704 based on previous year trends, which means with your rank of 329608 you may not secure a seat in BTech CSE at DDU Gorakhpur.

Admission to BTech CSE at UPES Dehradun is done based on the scores obtained in JEE Main and UPESEAT exams. Find their overall syllabus below:

JEE Main: JEE Main primarily includes Physics, Chemistry, and Mathematics based on the NCERT Class 11 & 12 curriculum.

UPESEAT: The syllabus is almost the same as that of JEE Main. It includes English comprehension and Current Affairs sections?.

For B.Tech students especially those pursuing computer Science engineering (CSE), Shiksha provides scholarships. Numerous universities that are listed on Shiksha provide their own merit-based scholarships, which are frequently determined by academic achievement or performance on entrance exams. Depending on the school and qualifying requirements scholarships can pay for whole or part of tuition. Shiksha also showcases commercial organisation programs and government scholarships such as the National Scholarship Portal. Opportunities and quantities vary by year and university.