How to set gcc 9.0 as default in ubuntu?

I installed GCC 9.3.0 in ubuntu, in a local directory. Which gcc --> data/softwares/gcc-9.3.0/bin/gcc gcc --version --> gcc (GCC) 9.3.0

While installing some software's, it is taking default version gcc 5.2 even after setting environment variable with gcc 9.3 version.

How do I rectify this problem, suggestions!

Thanks!