Hii!
The time and routine to study depends on you. It is fine if you feel comfortable studying at night rather than at morning. There's nothing wrong in it, unless you Study genuinely. So, relax.
Also, if you get a morning slot for the exam, make sure you get a good night's sleep atleast for that day. Sleep properly at night, so you don't feel sleepy in the examination hall and also feel refreshed. This will help you in performing well.
Hope this helps.
Good luck!

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