What are the best and simple advice's for an UPSC aspirant?

The question demands a concise and precise answer. Will try!

If you have been a top academic performer throughout, then

1. Set tough daily study goals
2. Find the best mentors
3. Raise the bar constantly. Challenge yourself
4. Stay in positive company always
5. Set weekly, fortnightly and monthly revision targets
6. Read, read, read; Write, write, write; Think, think, think
7. Take an off regularly. Allow the mind to collate stuff.

If you have been a moderate academic performer throughout, then

1. Start early. Give yourself more time
2. Set moderate daily study goals - you won't break down
3. Form a group of at least 3 friends with same goals. Motivate each other
4. Stay in positive company ALWAYS
5. Set fortnightly and monthly revision targets
6. Read, read, read; Write, write, write; Think, think, think
7. Take an off regularly. Allow the mind to collate stuff.

If you have not been an academic performer throughout, then

1. Start very early. Give yourself a lot of preparation time
2. Set easy daily study goals - raise the bar on a monthly basis
3. Find one good friend who understands you, and can motivate you
4. Stay in positive company ALWAYS. Ask parents for daily motivation
5. Set monthly revision targets
6. Read, read, read; Write, write, write; Think, think, think
7. Take an off regularly. Allow the mind to collate stuff.

All the best! 
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Source: https://www.quora.com/What-are-the-best-and-simple-advices-for-an-UPSC-aspirant/answer/Sandeep-Manudhane