Hi,

For IAS and CDS, it is necessary to complete graduation. However according to the criteria for CDS, it is mandatory for a student to have a degree in Engineering along with physics and mathematics as mandatory subjects in Class 12th specially for Air force. Thus, it is suggested for you to take PCM in 12th as it will keep your options for all the career possibilities.

You can refer these links for UPSC CDS and UPSC IAS for more detailed information: https://competition.careers360.com/exams/cds

https://competition.careers360.com/exams/upsc-civil-services-exam

I hope this helped you.