Hi Abhishek.

A Mock round of counselling is a practice counselling process conducted to help the students and parents understand the procedures of a counselling session and know the estimated cutoff and the branch seat that the student might get in the real counselling round.

Now, when seats from the previous rounds of counselling still remain vacant, an Open round of counselling is done to fill up those seats. This round is the last round to take admission in the particular college.