Hello Aspirant,

Since you have not mentioned the name of examination for which you are going to appear so it is quite difficult to guide you with an appropriate information. However if you are appearing for VITEEE 2021 Mock test then yes you should have two devices, first one is Laptop/Desktop/PC as primary device and second is your smartphone as you secondary device. As per the guidelines released by the authorities regarding VITEEE 2021 Remote proctored examination you should have both devices compulsorily for mock test as well. So if you don't have Laptop then you can use desktop attached with web cam and if you neither have desktop nor laptop then you have to borrow it from someone. You can check out the guidelines from the link given below :-

https://vit.ac.in/sites/default/files/viteee-guidelines-online.pdf

Now if this is for SRMJEEE 2021 remote proctored examination then there is no any compulsion for two devices for appearing in SRMJEEE 2021 mock test or in actual exam. So even if you don't have your laptop then you can appear for it using your smartphone only but make sure the front camera of your smartphone should be working and internet connectivity should be good. You can check out complete guidelines for SRMJEEE 2021 from the link given below :-

https://webstor.srmist.edu.in/web_assets/downloads/2021/srmjeee-21-instructions-to-candidates.pdf

I hope this information helps you.

Good Luck!!