If you think that you can not then you will not.
But if you are confused for you can or can not, then You may …..do it.
But if you’re ready to work for what you aspire more than your life then without a doubt
You will be able to do it .
Now the main question here is Why are you thinking for phy or chem ???
Are you aspiring to be a doctor?
If yes then you must be clear in your mind that you must do it , Even if you don’t feel like you can do it .
Always questions are same..
You wanna do it
Or not???