Hi Rahul,

It all depends on your career objectives in life.

After 12th if you're a student from a science stream you can go for b.tech or medical. Or from commerce background you  can give bba/bms entrance or can do b.com (H/P), BA (economic)., Can start preparing for CA/CS. Also there's lot of scope in LAW for that you need to give CLAT as an entrance exam for a respective college.

There are lot of good options at the end of day decision lies with your interests. wish you good luck.