Hello Aspirant. 

Preparation for B.El.Ed entrance exam depends upon the exam pattern i.e. as follows:

• Bilingual Language Comprehension Multiple choice English and Hindi-40 
• Subject Knowledge ( Mathematics upto class10)-20
• Subject Knowledge ( Science upto class 10)-20
• Subject Knowledge ( Social Sciences upto class 10)

The total paper will compromise of total 100 marks of each section defined above.

There is a book named DU B.El.Ed entrance from Arihant, you can buy it. It's sufficient for the exam but make sure your concepts are clear till 10th. You can also practice previous year question. 

Hope this will help you. 

All the best.