It is true, but requires supreme dedication, mindset and commitment. Sociology is most renowned to be a cram subject.
- Go though last 10 years past papers.
- Highlight repeating topics/questions = prioritize them.
- Study the theories (Karl Marx, Ibn Khuldun, Spencer etc.) as a backup (do minimum 3) as there will almost always be a question on this.
- Focus more on social problems of Pakistan (always a question on this = poverty, child labor, etc.)
- Social Change, culture, norms, values and other societal terminology should be deeply understood
- Socialization of man and migration should not be neglected.
- Methods of sociological research is a must - get well versed in this topic

[Try making your first draft notes on MS Word, then make more concise notes by hand on paper]
A good book I used for my notes is 'Sociology' by John J. Macionis - it details all of the terms and theories of sociology in the syllabus and further ferments with real life modern examples + problems.

Good Luck!