Hi Lavanya

As a BSc student you will be having botany chemistry chemistry and etc., Soo based upon your interest in the field go for the subjects. Don't depend upon on others or don't consider others words because you are taking the subjects not others soo which ever are interested choose the subject with interest. There is nothing like hard or tough it is the mindset in which way you see them so based upon your interest go with the subject. 

All the best