Your best way to get police clearance from Nigeria within 30 days....
Do paper fingerprinting with fingerprinting companies like Commissionaires.
They will fingerprint and give you the envelope to mail to Nigeria. If you know somebody in Nigeria (you should since you have family there) send the envelope to the person in Nigeria by courier and have the person go to Central Criminal Registry Force C.I.D. Annex Alagbon Close Ikoyi, Lagos IN PERSON. They usually do it same day or the day after when approached in person. Include copy of your passport. Remember the fee which is not much, plus handshake (LOL)
Have the clearance mailed back to you and then mail it IRCC. Any other way; you may wait "for ever" only to hear they never received the fingerprint you mailed directly to them.