LLB

Hi Ankita,
Decent English can help you a lot with LLB studies and even for good placements and packages. But, you do not need to worry because you can give the exam in Hindi as well but for future reference English shall help you overall. Try to read newspapers, books on daily basis. You can even practice on English workbooks to form a strong base.

You are eligible for 3 years LLB course. You may apply and appear for LLB entrance exams conducted by various universities such as DU, BHU, etc.

Doing three of them together is quite difficult and unnecessary. Instead, combination of any the above two like CA + CS or CS + LLB is recommended. Most people prefer CS + LLB as it gives full scope in company civil and criminal law.

MBA from Nirma University will a good option. They offer 100% placements for MBA and the average package offered is Rs.7.5 lakhs to Rs.9 lakhs.

To get in administrative services, you need to write civil services exam conducted by UPSC. The minimum qualification required to write this exam is that you must be of 21 years of age and you must have a Bachelor's degree.
You must complete your graduation, and then you can apply for civil services exam. You must start your preparation by reading newspapers. Then, you can read class 8th to 10th NCERT books. Slowly, you can catch up with the fundamental books required for UPSC.
All the best.

LLM or CS course will suit you more. You can pursue the same along with your MBA. If you interest is in finance then pursue CA along with your MBA. Any MBA degree will lead you to corporate legal career.

Yes, it is quite possible currently as per the system, you can surely pursue both the courses at the same time in the manner stated.