Hello Sameera

If you are poor in mathematics,i want to tell you that you have to face mathematics in both the streams,but you can choose computer science as it have less mathematical calculations, but mathematics is an important part of engineering and you can separate it.

So it will be better if you try to find out why you are weak in mathematics and how can you improve it.

Computer science have best job opportunities and also it's easy then electronics and communication, you can also go for other degree or courses like bsc where you have to tackle the mathematics less and here also you can take bsc with computer science.

I hope it helps