Hi, you can find previous year's papers from DU official website along with the answer key.

http://www.du.ac.in/DUET.html

In this link you'll find paper for the year 2018 along with the answer key.

If you need more papers you can just google it and have many results at your end.

For ba hons social science and humanities entrance exam just be thourough with the current affairs, practice your english grammatical and writing skills and vocabulary and practice logical reasoning.

The exam will have 5 sections:

• general awareness
• current affairs
• general knowledge
• communication skills(english/hindi)
  
• logical reasoning and analytical ability

each section will have 20 questions. For every correct answer you will be awarded 4 marks and for every incorrect answer 1 mark will be deducted.

Good Luck