Today I just study Math hard

=> Today I study Math and it's hard.

I realy dadication for studing

=> I'm really dedicated when it comes to studying.

but now I'm patient before I think twe mounth past

=> but now I have to be very patient than before because it's been twelve months past.
I have a bad cold and..

=>I have a bad cold and...

still I have a cold

=> until now.

but unfortunatly I just have a cough and runny nose.

=> and unfortunately I have a cough and runny nose.

I hope that my cold run away

=> I hope that this cold will be over.