Hi Md Hafizi,
Well done for identifying that your problem is related to the time it takes to process the form.
I would think that a timeout setting in your php.ini file might be to blame or your server / client hardware needs some beefing up.
I have just created a course with more than 1000 students and had no problems taking attendance for all 1000 at once.
Cheers,
Barry
Attendance (plugin)
A required parameter (id) was missing
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