Hi bishmita
As you may be knowing that AEC is among the best engineering colleges under CEE Assam.
So, usually there is a huge competition to get in there.
So, only the  rankers get admission in AEC.
Now since you have secured 804 rank (141 marks) in CEE 2019.
So, you do have chances to make it to chemical branch in AEC.
So, I would advice you to participate in the counseling process and look for the branch and the college you get according to your rank.

For more information you can refer to the following link
https://www.google.com/amp/s/engineering.careers360.com/articles/assam-cee-cutoff/amp

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