SMA Negeri 3 Bengkulu Utara Terdiri dari 2 Jurusan yaitu MIPA dan IPS dengan 3 tingkat Kelas yaitu kelas X, XI dan XII.
| KODE KELAS | KODE LEVEL | NAMA KELAS | KODE JURUSAN | Jumlah Siswa |
| X-IPA1 | X | X-IPA1 | MIPA | 31 |
| X-IPA2 | X | X-IPA2 | MIPA | 27 |
| X-IPA3 | X | X-IPA3 | MIPA | 29 |
| X-IPA4 | X | X-IPA4 | MIPA | 30 |
| X-IPS1 | X | X-IPS1 | IPS | 31 |
| X-IPS2 | X | X-IPS2 | IPS | 31 |
| X-IPS3 | X | X-IPS3 | IPS | 30 |
| X-IPS4 | X | X-IPS4 | IPS | 29 |
| XI-IPA1 | XI | XI-IPA1 | MIPA | 24 |
| XI-IPA2 | XI | XI-IPA2 | MIPA | 25 |
| XI-IPA3 | XI | XI-IPA3 | MIPA | 25 |
| XI-IPA4 | XI | XI-IPA4 | MIPA | 24 |
| XI-IPS1 | XI | XI-IPS1 | IPS | 22 |
| XI-IPS2 | XI | XI-IPS2 | IPS | 22 |
| XI-IPS3 | XI | XI-IPS3 | IPS | 23 |
| XI-IPS4 | XI | XI-IPS4 | IPS | 21 |
| XII-IPA1 | XII | XII-IPA1 | MIPA | 23 |
| XII-IPA2 | XII | XII-IPA2 | MIPA | 21 |
| XII-IPA3 | XII | XII-IPA3 | MIPA | 23 |
| XII-IPA4 | XII | XII-IPA4 | MIPA | 23 |
| XII-IPS1 | XII | XII-IPS1 | IPS | 22 |
| XII-IPS2 | XII | XII-IPS2 | IPS | 21 |
| XII-IPS3 | XII | XII-IPS3 | IPS | 21 |
| XII-IPS4 | XII | XII-IPS4 | IPS | 23 |
Total siswa siswi SMA Negeri 3 Bengkulu Utara sebanyak 602 orang siswa per April semester genap tahun ajaran 2018/2019.
