Hi Hrishi,
Firstly, I congratulate you on securing the 2868th rank in Assam CEE 2019 and now to answer your question since you belong to the OBC-NCL category and have secured 72 marks, you have a fair possibility of admission in Assam Engineering College, Guwahati. Although the streams on offer with your rank are:
If you are lucky you can even get admission into CSE and ECE departments.
BEST WISHES!
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