I have 95.99 percentile or 45,000 rank in JEE Mains 2019.Which best possible college I can get with cs,IT or cse.

Hello Tanya Agarwal ,
First of all congratulations for clearing JEE Main and getting such a good rank in it .With a percentile of 95.99 and a rank of 45000 in JEE Main 2019 ,the best College in which you can get Computer Science Engineering is Thapar Institute of Engineering and Technology, Patiala also known as TIET, Patiala .
Hope it helps and all the best for your future endeavors .

Hello

With this score its tough to get government colleges with your required braches but if you want to check for other branches you can check for previous year cutoffs of NIT's on the following link
https://www.google.com/amp/s/engineering.careers360.com/articles/nits-cutoff-for-top-btech-branches

If you only want the above mentioned branches then you can go for top private institutions like Thapar University or Jaypee Noida,  where you'll definitely get admission in your desired branch.
Hope this solves your query.
Good Luck!!