If you pay more then half of your own support for the year then you cannot be claimed.
Usually the largest support issue is housing and food. If you live in your mothers home then she is supplying that. If she owns the home then you fined the fail rental value of the home, cost of utilities and maintenance and divide by the number of occupants.
See:
Pub 501 Worksheet 2 for determining support
https://www.irs.gov/publications/p501#en_US_2020_publink1000292527
**Disclaimer: This post is for discussion purposes only and is NOT tax advice. The author takes no responsibility for the accuracy of any information in this post.**
