Colleges in Uttarakhand

Yes, it is as this is the best college in the whole Dehradun region and also because of rapid development in this region, this college's placement for this course is increasing year by year.

You should opt for UPES as in IPU, getting any good college at this rank for an outside Delhi student is not possible.

Yes, you can easily take admission in this college no matter whether you are from NIOS or from any other board.

I would suggest you opt for the MSIT as this is the best college in all the colleges that you have mentioned above and also in this college, you will get more exposure than any other college as because of it's location.

Yes, you can appear for the same and pass this year.

For admission in this college, you have to appear for UPES-EAT or you can get admission through management quota but in that, you have to pay some donation.

There is no guarantee for 100% placements. And, you can opt for the course, if you think you have passion for the course. As per my information, there are many student (certified Yoga trainer) who get placed in China via placements agencies are get INR. 6 Lacs package starting. So, you can go for the course if you would really like to purse it.
Companies / Recruiters who visited the campus for Placements are below.
Apollo Hospitals
NTPC
Prime Focus
Tech Mahindra
Wipro

Eligibility criteria for MA in Japanese from Doon University is as below:
Graduate in any stream with Chinese or Spanish or Japanese or German language as one elective subject or Diploma in any of these languages from a recognized University/institution with minimum 50 % marks (45 % for SC/ST from Uttara hand).
If you fulfill this requirements , you can apply for the course.
https://www.shiksha.com/humanities-social-sciences/languages/course/m-a-in-japanese-jawaharlal-nehru-university-mehrauli-delhi-268801

Yes, admissions to B.Tech programmes shall be made by the university on the basis of merit of Joint Examination conducted by CBSE, New Delhi.
For more information please refer to to official website of the university.
Thank you.