Follow a below mentioned steps.. so you wouldn't be fed up.

1. Make a group of 3 to 4 friends to keep yourself updated and motivated.
2. Keep getting proper guideline from a fresh CSP or those who have cleared CSS in good marks.
3. Join any academy if possible.

By above mentioned steps you would automatically make your routine and proper strategy.

Choose scoring subjects amongst listed one:
1. Philosophy
2. Punjabi
3. Persian
4. Journalism
5. Sociology
and relevant to your past study experience
don't choose history subjects because they are not scoring

Make your study plan according to your temperament but keep balance.
Stick to past papers.
let your essay and other writings regularly checked.