Hey!
You can definitely pursue Law after engineering. Just like every institute, BHU also welcomes students from engineering background to pursue law.
The minimum eligibility criteria for L.L.B.(Hons.) is a graduation degree, minimum 45% marks in graduation (for general category) or 40% (for reserved categories).
Also, some institutes have a criterion for minimum marks in graduation, which may vary in different institutes.
And generally,There is no age limit for taking admission into L.L.B.(hons.).
Hope this answer helps!
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