Let me show you the instructions in the professional catalogue first: Choosing 804 as the initial test subject is only suitable for applying for the insulation direction of 03 high voltage and insulation technology. Re-examination subject: 0 1 The re-examination subject of motor direction is electrical engineering (including motor design). Enter oneself for an examination 0 1 electrical appliance direction retest subject is electrical appliance principle. 02, 06 direction retest subjects power system analysis and relay protection (power system analysis accounts for 70%, relay protection accounts for 30%). Enter oneself for an examination 03 high voltage and insulation technology high voltage direction retest subject high voltage engineering. Enter oneself for an examination 03 high voltage and insulation technology insulation direction retest subject dielectric physics. 04 direction retest subject power electronics technology. Automatic control principle or analog electronic technology foundation of 05 direction retest subjects. Learning Xi Jiaotong University's Postgraduate Entrance Examination Network will have more re-examination experience to share. You can go there if you need it!