Dear Aspirant

The last date for b.tech slot booking is 31 may 2021 and you are right m.tech is extented upto 14 july

You check on Official website https://manipal.edu/mu/admission/indian-students/online-entrance-exam-overview/centres.html

And if you wanted to know more about it check out the link given in below https://www.google.com/amp/s/engineering.careers360.com/articles/met/amp

I hope it will help you

Thank you