Hello,

It seems that your question is little incomplete as you have not mentioned the name of the exam which you have trying to attempt and definitely you should set your target quite high as it is a competition site and every a huge number students apply for admission in all the best colleges, and after that i definitely i will suggest you to try for the admission in your desire colleges so you have positive sign of getting admission. Now talking about getting a less score in Chemistry or physics will surely can affect your overall rank. Hope so it was helpful for you.

Thank you..