Hello student. So if you can do maths really well, then take cec out of the list. Now the remaining 2 groups are there, mpc and mec.

Both has maths in common. Now decide based on your future perspective. If you are interested in engineering, then go for mpc. With mpc, you can enter into commerce courses too if you wish to. But if you choose mec, it gets narrower

So I would suggest you to go for mpc