Hi

It's completely depends upon the cbse school you want to get admission in dear.

But yes,

To get admission in good schools, you should get at least 90+% to get PCMB i. e science with both maths & biology.

For example,

I have studied science  with both maths and Biology i. e PCMB in my    10 + 2 from cbse and  to get admission I had scored 9.8 CGPA in my class 10th which is equivalent to 93.1 % and I easily got admission in one of the Kendriya Vidyalayas which are  government chain of CBSE schools present pan India.

But yes,

In average schools, you can even get PCMB with around 80 % marks .

Also,

One advantage of choosing pcmb is after 10+2 you can go for both medical courses like MBBS, bams, nursing etc and non medical courses like engineering as well.

So,

Follow the below tips to prepare well for your 10th board examination so that.you can get pcmb:-

• Go well through the chapters

• Make short notes so that you can revise them easily during your exam

• Go through previous year question paper of your board examination

• Solve at least 2-3 sample paper for each subject

Thankyou