Hello,
If you have taken commerce stream then you have to search online courses available for mathematics.
E.g. career centre.
There are many online videos which will help you more with understanding and concepts.
No need to worry practice daily in the morning hour for at least 2 hour then you will Excel in maths.
If you need any more help then you can tell us. Feel free to ask.
You have to fight against your comfortableness to get into maths and leave using cellphones.
All the Best!