In Nigeria, most polytechnics require students to pass the Joint Admissions and Matriculation Board (JAMB) examination before being admitted into the institution. JAMB is a standardized test required for admission into many institutions of higher learning in Nigeria, including polytechnics. However, some polytechnics may consider admitting students without JAMB, such as those that offer evening or part-time programs.  Also, some polytechnics may have an alternative to JAMB, such as an internal entrance examination. It's important to check with the specific institution you are interested in to determine their admission requirements and if they admit students without JAMB.