CBSE 12th

You can do B.J.M.C. from Jamia, D. U, IIJMC Bangalore, Bennet University, Symbosis, Asian college of journalism Chennai, IIMC New Delhi, Journalism department central universities like BHU ( low fees, brand value), Madras Christian college, VIPS Pitampura, Christ University. These are few top college for journalism in India.

By studying veterinary you have a bright carrer and option for IFS and more chances to work in govt. departments.
Few renowned coleges for studying veterinary are
IVRI Bareiily, G.B pant , NDRI Karnal , VCRI Chennai, CVAS Bikaner.There are govt. Vereniary colleges in almost every state.
For that you have to appear for ICAR exam.The list of college is also given in ICAR website .ICAR also has college ranking.
Best wishes.

Not bad if you want to improve your 12th aggregate score. But first give priority to the B.Tech CGPA/ Percentage because of placements. Yours 12th marks will not matter here.

For preparing NEET first important thing is that concept must be made clear weather from ncert or any other books which you think easy to understand. Try to solve question papers and mcqs of each subject. Both exams are important for you, for admission in medical college. Give your best. Study hard and smartly to conquer good marks take proper guidance. Give most time for self study. All the best.