Dear aspirant

Why would be you take so much tensions by giving two boards exam.

You can take all four subjects as in single board every board provide that pcmb subject to take as your subject in either in state board or CBSE. In state board you can take PCB as main subject and add mathematics as additional subject or you can take pcmb in cbse as your subjects.

Many candidates gives their boards exam by taking pcmb to eligible for both jee mains and neet exam. By choosing one board you will be spare of giving exam of other boards and sometimes dates might also match ups.

So my suggestion as for you just choose one board according to your comfortablity and put choose four subjects in same board and then you can prepare for your respective entrance exam.

Hope this information helps you

All the best