Hello Mahantesh,
Thank you for contacting the Microsoft Community.
As per Minimum system requirements of Pearson Vue, they would recommend a wired network as opposed to a wireless network.
These links provide information about the system requirements and protocols for taking online exams.
You may also contact the testing vendors for further assistance. You can reach them through the following contact details below:
For Pearson VUE:
https://home.pearsonvue.com/microsoft/contact
I hope this helps.
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Best Regards,