i have not allotted any seat in mock round, is it worry some or i can expect in the next rounds

No, it's not necessarily worrisome that you didn't get a seat allotment in the mock round of JoSAA counselling.

The mock round is a simulation exercise to familiarize candidates with the counselling process and seat allotment procedures. It doesn't reflect the actual seat availability or your final chances of getting admission.

The mock round doesn't utilize the actual seat locking choices of candidates. Many candidates might change their college/program preferences or withdraw from the counselling process after the mock round. This can lead to significant seat movement in the subsequent real counselling rounds.

With the actual choices of candidates coming into play, the real counselling rounds will reflect the actual seat availability in colleges based on the preferences of all applicants.

Carefully review and prioritize your college and program choices based on your JEE Main rank and previous year's cut-offs. This can increase your chances of securing a seat in the desired college during the real counselling rounds.

Keep an eye on the seat allotment results after each round. You can see if seats are opening up in your preferred colleges due to candidate movement. You might also use the seat allotment results to strategically adjust your choices in subsequent rounds.

https://engineering.careers360.com/download/ebooks/josaa-what-you-need-to-know

I hope it helps!