Hi Aspirant,
You can persue LLB after you btech. The eligibility criteria for pursuing LL.B is that you have to get minimum of 50% marks in your graduation degree.
If you want to persue LLB only in Andhra Pradesh you have to appear and qualify in Aplawcet exam or you can apply for CLAT in order to get into NLUS. In Andhra Pradesh there is Damodaram Sanjivayya National Law University.
You can take coaching for Clat or Ap Lawcet for entrance exam to get into law courses.
You can refer this link for more information :-
https://law.careers360.com/articles/ap-lawcet/amp
Hope this helps
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