CBSE 12th

Yes, you definitely can. There are three pathways to appear in IISER exam I. e. Either through KVPY or JEE or SCB. Since you have dropped mathematics you can either go through KVPY or SCB. So, check your SCB according to your state and then you can apply if you qualify the cut-off marks.
All the best!

Hello,
There are various entrance exams for in particular for B.Tech in biotechnology, though you need to appear in for NEET UG.
Good luck.

Hi, it depends on the exam you are planning to give and the college you are aiming for. Because, the eligibility criteria varies for each. If you have some quota, you will be granted leniency in the eligibility criteria. However, in general category, you wouldn't get to apply for exams such as CAT with less than 50%. Hope it helps. All the best!

No, I strongly believe that you should take up a good coaching institute and study hard.

Do engineering or B.Sc. In physics. .

Yes, you can apply. You just have the clear the entrance exam.

Hello!
The basic eligibility criteria for WBJEE JELET is Diploma in engineering.
All the best.

Yes, you are eligible for the same.

Hi, low budget countries you can consider are Germany, France, Canada, Netherlands, Poland, Ireland, Spain, Italy, New Zealand, and Singapore among others. Singapore, however has strict employment opportunities, but if you are a brilliant student it shouldn't be a concern.

Hi,
Please find the link below:
https://www.shiksha.com/hospitality-travel/hotel-hospitality-management/nchmct-jee-exam-dates.