What to do after pcmb 12th .....
1) Bsc in Life sciences, Zoology, botany & many other subjects from reputed Indian colleges & Universities that conduct simple aptitude test or admit students based on their +2 marks. After completing this you can opt for higher studies like Msc, phD to become a research scientist or opt for teaching.
2) Many institutes provide Integrated Bsc B.ed or Bsc Msc in life science, Zoology , etc subjects where after completing you can immediately opt for job as teacher or something similar.
3) Biotechnology & Bio engineering is definitely a great choice opening resarch opportunity for interested candidate.
4) Nursing, Hospital management & many more not so core but associated subjects come up if you look around depending on your interest.
Good Luck, choose wisely.