Hello Katakamsetty Bharath Kumar...

In order to take the DAT you need to receive approval from the department of testing services at the ADA.You will first obtaion a DENTPIN and then submit an application.

yes they will sell sample books for nid DAT entrance exam.

best books for nid DAT are

NID DAT book by rs aggarwal

design drawing by francis d k ching

basic rendering from robert w.gill

NID  mock test series

All the best

Thank you

HELLO ASPIRANT,

prerequistes details for NID DAT entrance exam:

1) valid email id

2) academic qualifications regarding class 10+2 ,graduation details 

3) personal details such as mobile number , proof 

4) image of scanned photograph  of passpot of recent one and digital signature 

5) other details like caste certificate , disability certificate if possible 

the main thing is login with credentials of yours and provide basic details like fathers name ,mothers name ,marks secured etc

hope you understood 

 thank you