B.Tech Mechatronics Engineering

Hi Austin Paul, first decide where to study. Different countries have different admission requirements. Also every university has its specific requirement. Scholarships are given by the foreign universities on the basis of merit. If you have a good profile then they will give you scholarship. Check here
https://studyabroad.shiksha.com/be-btech-in-abroad-dc11510

Yes, you can, but it might not be possible in this academic year. Try next year.
Cheers.

Hello,
Please refer the link to get more insights of the colleges and branches.
https://www.shiksha.com/resources/college-comparison
However, Hindustan College of Engineering is better.

Hello Vignesh,
Yes, you can do m.tech aeronautical engineering after B.Tech mechatronics.
In Mechatronics, you should have came across basis mechanical engineering subjects such as thermodynamics, strength of materials, statics and dynamics of machinery etc., which is useful when you pursue your Masters in aeronautics.

Hi Raghu,
These are the leading universities in no particular order:
RWTH Aachen
TU Mnchen
TU Berlin
TU Darmstadt
Uni Stuttgart
TU Braunschweig
Check this too for latest rankings:
https://ranking.zeit.de/che/en/rankingunion/show?esb=10&ab=3&hstyp=1&subfach=103#&left_f1=651&left_f2=23&left_f3=526&left_f4=42&left_f5=14&order=alpha&unionview=table&subfach=103