There are no hard and fast rules regarding the subject selection in the counselling. You can select any subject of your choice. But its always advisable to take some lower branches as well if you have lower ranks in order to be safe. Else you can choose all CSE options.

To know more about JOSAA counselling visit the link below:

https://engineering.careers360.com/articles/josaa-counselling

To know more about JEE MAINS college predictor visit the link below:

I hope this helps.