Hello uday,
OMR sheets are evaluated by computer software, this software is very sensitive and only it will read the proper filling of bubbles. Do not scratch the omr sheets

Practice at home with pencil, firstly do your question in 1 hour 30 minutes and then fill your or sheets.
As you said in 20 minutes you can't do, then try to do together like after reading the question and you know the answer, then simultaneously round the bubbles this will help you completing the 180 bubbles easily.
Do not apply much pressure ,control your anxiety level.
Thank you

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