As you are in the first year of graduation. This is the best time to start preparing for UPSC .

Here are some tips i will give

First of all know the exam well . Understand its criteria.. the sections , marking scheme etc.. Do a research ABOUT what the exam is

Make a time table to manage your graduation and upsc preparation at the same time. Planning and executing is the most important. Make your schedule in a routine you find the best for your day .

Do check the mocks , you can also opt for coaching , they will guide you in a best way

And the best tip is writing practice . The most essential ingredient in clearing these exams.

And ya ..Good to hear that you are starting  preparing for it in first year of graduation. So now follow the tips .do research and just devote everything to this preparation. All the best .