Hi Aspirant,
Firstly I congratulate you on securing the rank of 16871 in WBJEE 2020 and now to answer your question, please refer to the following link to view the cutoff ranks of the colleges under WBJEE 2020:
https://engineering.careers360.com/articles/wbjee-cutoff
I understand that you didn't participate in the 1st round of counselling and so to answer the 2nd part of your question, you would be able to participate in the 2nd round of counselling if and only if you had registered for the counselling process before the 1st round but were not allotted a college of your choice in the first round itself.
Now to answer the third and the last part of your question, with the rank of 16871, you wouldn't be able to secure admission into Aliah University as the cutoff ranks are much higher than the one that you secured. However, if you would have applied for the counselling process, you should have had a slim chance of getting a seat at Aliah University in the mop-up round of counselling.
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