B.Tech

Hi Abhishek,
It is best you use the college predictor tool here:
https://www.shiksha.com/b-tech/resources/mhcet-college-predictor

COEP, PICT and D. Y. Patil College of Engineering Akurdi are the top colleges in Pune.

Dear, if you have not given any entrance exam for B.Tech, course it is not a problem. You can take the admission on the basis physics, chemistry, and math percentage in RTU quota.

There are many websites which provide college ranking, you can compare two to three websites to figure out the top colleges.

Hi,
If you are talking about applying to Australian universities for higher studies you have to check with the universities directly if KOSU degree will be accepted. Every university has different admission requirements. For immigration purposes you have to check with an immigration officer, here we

Check out the link below and click on Know College Cutoff:
https://www.shiksha.com/mhcet-college-predictor

B.Tech is not possible without mathematics. So, I suggest you that you can visit the campus of Anand College of Engineering, Jaipur, where basic mathematics and physics classes is going on. So that, your fear in maths is removed and you can complete your degree.
All the best.

Yes, it is very helpful to you if you do it from good college.
Most companies prefer students having both technical and management degrees.
It will also provide you good salary and better post.