CBSE 12th

Hi,
Ofcourse I can help you with any query that you might have. But please try to ask questions in Hindi the national language of India or in English the language of the world. Regional language should be avoided. Without understanding questions I can't help you.

There are numerous colleges, mainly private, where you can get direct admission after 12th as per your subject in class 11th and 12th without giving any entrance exa. The course will completely depends on your field of interest like B.Sc. B.Com B.A. BCA BBA and so on.

There are many entrance exams for B.Sc. Nursing for top universities like CMC B.Sc. Nursing Entrance (CBT), CUET AFMC, JIPMER, NEET NIMHANS etc. But there are some private colleges that give direct admission to PCB students with 60% in 12th like Abhay College of nursing, Bangalore, MS Ramaiah nursing college, Vydehi Institute of nursing, RV nursing college etc.

No, you can't take admission in Ravenshaw University, if you have failed the accountancy exam because it is a core subject and if you fail in it, you won't be eligible for admission in Ravenshaw University.

Go through the CUET Previous year's Question Papers at least Twice. This will give you an idea of the Exam pattern and Question Difficulty level. Devote more time to solving the Mock test, model question papers, and sample papers.

Yes you can do D.Pharma by getting Science done by NIOS.

Yes you can write 2nd PUC exam directly by taking Science.

Absolutely,
Your 10th 12th marks does not have guarantee with you being successful or even you getting placed on the basis of these results. However, some companies do ask for this criteria but always remember that these marks aren't going to help you in long run. What is going to help you is your skillset. So rather than to think about why you got so less marks try and build up more skills which will help you during interviews in IT sector.