JEE

You can get NIT or IIT according to me there is no use of that because on a rank of more than 50000 we can get a bad Institute or a bad branch so, don't expect something more
I got triple IIIT Kalyani CS with the rank of 40000 but I didn't went there because it is a very bad Institute with low placement also it has huge fees offer of 3 lacs per annum
it's better to join some private college or took a drop
it's never too late you can start by August too, all it depends on you but forget to have good NIT or Triple IIT with a good branch with rank of more than 50000 it is even impossible with rank of more than 35000 in CSAB too, competition has become damn tough you have to give your hundred percent to get what you want, what you deserve.