Lowkey, I was in the same boat 3 yrs ago. Dont worry, Biochemistry, Mol biology and other subjects are under radar. So just chill out and you will be cleared in 3-4 weeks. No need to worry. They will return your passport in a day or so and call you back to drop passport again for visa stamping. You can email me if you need more information. 

Take it easy, its normal.