Hi

This is a bit difficult to predict as your marks vs percentile vs rank in JEE main depends upon a number of factors like

>>>> number of students that appeared in the  jee main exam,

>>>>kind of marks obtained by them ,

>>>>toughness level of the jee main examination for different shift etc.

But yes,

As  per our predictor at

With 80 marks

--------------------) your percentile will be around 86.23 - 89.35 considering  the  shift mentioned by you of moderately easy level paper as per the analysis by experts .

JEE mains 2021 expected qualifying  CUT OFF percentile to be eligible for jee advanced is given below for different categories on the basis of past year trends :

Category                  jee  main 2021 expected off percentile

---) General :-                         90-95

---) GEN-EWS :-                      70 -75

---) OBC-NCL :-                        70 -75

††† So, you hold very good chance to be eligible for JEE advanced 2021

---) SC     :-                                  50 -55

---) ST :-                                       40 - 45

---) PwD :-                                       1- 2

You can check the same at our page the link is provided below

https://engineering.careers360.com/articles/jee-main-cutoff

To help you get  the complete list of colleges that you can get , we have JEE main college predictor ,the link for which is provided below::

https://engineering.careers360.com/jee-main-college-predictor?icn=QnA&ici=qna_answer

Thankyou