I am giving complete list of Test Centres with Code for BCECE Examination here:

BCECE Examination Test Centres with Codes:

Name of Exam Centre Centre Code
Patna 1
Bhojpur 2
Bhabua 5
Gaya 7
Nawada 8
Arwal 10
Saran 12
Gopalganj 14
Vaishali 15
Sitamarhi 17
Sheohar 18
West Champaran 20
Darbhanga 21
Samastipur 22
Saharsa 24
Madhepura 25
Katihar 28
Kishanganj 29
Bhagalpur 31
Banka 32
Munger 33
Khagria 35
Jamui 36
Shekhpur 38
Jharkhand 39
Madhubani 23
East Champaran 19
Supaul 26
Purnia 27
Araria 30
Begusarai 34
Lakhisarai 37
Aurangabad 9
Siwan 13
Muzzafarpur 16
Jahanabad 11
Buxar 3
Nalanda 6
Rohtas 4
Other states outside Bihar 40