Firstly, after the mains examination, the UPSC (Union Public Service Commission) will release the list of candidates who have qualified for the interview stage based on their performance in the mains exam.

Notification by UPSC:
- Once the list is released, candidates can check their results on the official UPSC website or through other communication channels.
- The UPSC will also send an official notification to the qualified candidates regarding the interview schedule, venue, and other important details.

Interview Call:
- After the notification, candidates can expect to receive a call or email from the UPSC informing them about their interview date, time, and other necessary instructions.
- The call for the interview will usually be made to the phone number provided by the candidate in their application form.
- It is important for candidates to keep their contact details updated and keep their phones reachable during this period.

Preparation for the Interview:
- Once the interview call is received, candidates should start preparing for the interview by revising their optional subjects, current affairs, and other relevant topics.
- It is advisable to also practice mock interviews to gain confidence and improve communication skills.
In conclusion, after the mains examination, candidates can expect to receive a call or email from the UPSC regarding their interview schedule. It is crucial for candidates to stay updated and prepared for this final stage of the UPSC examination process.