Colleges in Chandigarh

You may check on these institutes like Institute of Technology, Guru Ghasidas Vishwavidyalaya (A Central University), Sant Longowal Institute of Engineering and Technology, Longowal, Shri Mata Vaishno Devi University, Katra and HNB Garhwal University, Srinagar.
As you are expecting a good percentage in 12th, you have good chances of getting top branches.

Yes. B.Sc Hons. mathematics, I available in DAV College, Chandigarh. You can apply in the month of June and July and admission will be through the merit list.
Best of luck.

As last date for the PU is May 30, CBSE will announce results between May 25 to 30 and I am sure by May 28 results will be announced and so you can fill your form for the same .
All the very best!!

Yoga quota is available in some courses. It depends on the course you want to pursue.

Yes, in second year you can choose your honors subject.