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y dear.... don't be fear It's ok if you have done mistake in choosing Basic Maths and Standard maths .....well I am also a 10th grader and waiting for the results of academic session (2021-2022)....well If you want to opt PCM in class 11th .......YES!! ITS TOTALLY POSSIBLE ...A BIG THANKS TO CBSE......After thr the declaration of your 10th board CBSE announces Compartment exam datesheet so you have to give that Compartment exam ( a standard version of maths paper) ...... after that result of compartment exam will come on official website of CBSE and after that you will be able to opt PCM in class 11 ...for more detail contact your class teacher or maths teacher.....Give your best babes!!!! Learn from your mistakes .

Dear aspirant hope you are doing well..

As you already chosen basic math, Now you are not eligible for pcm (physics, chemistry, maths) in class 11& 12 but you are eligible for  pcb(physics,chemistry,biology). Any more related Query you have. You can comment on comment section below..

Hope it's helpful for you..

Thank you