You need to study collectively through the labor department or training center of the unit, and then take the exam.

Underground mechatronics is a special type of work, and you may not be able to learn it yourself, but you can go to the local labor and social security center to learn it! Some places are free! In addition, you can go to the vocational skills training center, register, pay tuition fees, and issue electrician certificates and employment certificates after graduation (essential for electrician job hunting)! Tuition and certificate fees are about 3000 yuan!