As you asking for the procedure to get the Application form of the SCRA examination let me tell you that as per my knowledge the application form is not available at present here I am giving you the procedure through which you may get the Application form for the SCRA examination when it is avaible

go to the official site of the UPSC
the page may look as follow :

UPSC

there you may find the menu of the Examination click on it .

it may redirected you to the page from there you may get the link of the Application form of the SCRA Examination when it is available for your convince here I am giving you the snapshot of that page