Hi Naina!

For appearing for exams for admission into Bachelor of Education in Special Education, 

You would need to be well versed in the following sections of study :

• General Knowledge, mental and teaching aptitude and ability
• English Comprehension
• General Aptitude
• Subject Test 

Some books that cover these topics well and can give you good amount of practice are :

• B Ed Entrance Examination  -  Gupta R
• GGSIPU B.Ed Entrance Exam Guide by Arihant Publications 
• IGNOU B.Ed Entrance Exam Guide by Dr.Lal and Jain 

The content in all these books are more or less the same.

These books also contain of previous years' questions papers for your practice.

Hope this helps , all the best!