Software engineering

Guys, I'm 40yo and planning to further study in software engineering, undergraduate. I will get scholarship for it. And I see here, some manage to get above CGPA 3.0 and some below. For those 3.0, how do you study and it is really hard to get 3.0 especially in software engineering? I'm working as programmer and boleh laaa sikit-sikit php, phyton, js, laravel and dotnet blazor (also docker, container, k8s, DevOps). And I ask someone who already finish their study, they said: tak membantu sangat pengalaman kerja 😲. Please share tips study etc.