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Try this script included in AT Command Tester Tool.
//Script: at+cmnb
//This AT command is applicable for SIMCOM modules only
//Check SIMCOM Module AT Command documentaiton
//Preferred selection between CAT-M and NB-IOT
//Get the list of supported modes
AT+CMNB=?
//Read the current preferred mode
AT+CMNB?
//Wait
WAIT=2
//Set preferred mode to CAT-M
AT+CMNB=1
//Wait
WAIT=1
//Set preferred mode to NB-IOT
AT+CMNB=2
//Wait
WAIT=1
//Set preferred mode to VAT=M and NB-IOT
AT+CMNB=3
Output of above script in AT Command Tester Tool.
AT+CMNB=?
+CMNB: ((1-Cat-M),(2-NB-IoT),(3-Cat-M And NB-IoT))
OK
AT+CMNB?
+CMNB: 2
OK
AT+CMNB=1
OK
AT+CMNB=2
OK
AT+CMNB=3
OK