LLB

No, you cannot. LLB is a regular degree course, and you cannot pursue two degree courses together.

CS + LLB is a good combination and LLB is a beneficial course.

Although, LLB cannot be done through distance learning but still you can do LLB from any state university affiliated college along with your job because they consider the pupil's job profiles which do not allow them to attend regular classes thus they waive off the conditions of attending regular classes and you can just appear in exams, while continuing your job.

You should start your CS now and continue with LLB or both after the degree.

Hi Deepak,
BA LLB is itself a graduation course. After 12th it is a 5 years program and after graduation it will be 3 years program. So, it always good to pursue BA + LLB or BBA + LLB or integrated LLB to save 1 year.

Both, pharmacy and law are diverse profession. You will be able to use both field's knowledge if you want to be a specialist in drug and Pharma or want to be an IPR lawyer. Law is a very good profession with opportunities as corporate lawyer, law KPO or independent consultancy and practice.

You need to pass class 12th exams with at least 60% marks and you need to fill the form of CLAT, LSAT, GGSIPU law entrance exam before January. You need to prepare yourself from right now for the law exams, so you can excel your potential in the exams.
Best of luck.

Yes, you can pursue LLB after completing your B.Tech however, it is not advisable since you have already gained specialization in engineering background. It will be entirely a field change however, on the other side it could help you depending upon how you use your knowledge in engineering and legal together as a professional. You might be able to get a job in legal department of an engineering company. So, it is advised to think for some time before going for LLB.
After graduation it will be 3 years program and be sure to pursue it from BCI approved university.

Both options of five year integrated law degrees are equally good. If you are targeting to become a corporate lawyer then BBA is a better option.