@iamcalledasad
yes you can opt it. go through other posts in psychology forum.
if you have no background and never studied biology first then it is going to be difficult and lengthy. a lot of hard work will be required.check its syllabus ,you interest and aptitude,then opt it.
a scoring subject does not mean you just opt it. it can be a disaster as well if you cannot prepare it well.
and as respected member Almaas said 'gauge yourself and then go for it'
choice is yours.

@Crown prince
you have rightly said and as per your royal command ,question is answered.

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Reality is something you rise above.