Hello
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Yes,You can apply for CA  after your MPC. You will have a good opportunity if you have completed CA successfully as you are a maths student. At starting you may find it difficulty, because you have no idea about accounts and business. MEC and CEC are 2 best major course's for CA. Now you will go with 3 level's,

• CA foundation
• CA inter
• CA final

In CA foundation you will have 4 examinations
Most of the Institutes offer students to join CA inter  after completing graduation or of without CA foundation..In CA inter you will have group 1 and group 3 examinations And final you will get with CA final with again group 1 and group 2 examininations. Once it's done you can get a job in reputed/top companies, banks, MNCs with good amount of packages