30/60/90-day study plan for Java SE 21 Developer Professional (1Z0-830): recommended hours, weekly schedules, and practice integration.
Java certs improve quickly with daily code practice. Most candidates pass with 60–120 focused hours.
| Your time | Recommended timeline |
|---|---|
| 18–22 hrs/week | 30 days (intensive) |
| 10–14 hrs/week | 60 days (balanced) |
| 6–9 hrs/week | 90 days (part‑time) |
| Week | Focus | Output |
|---|---|---|
| 1 | Core syntax + OOP + records/sealed awareness | Topics 1–2 + drills |
| 2 | Generics + collections + streams | Topics 3–4 + drills |
| 3 | Exceptions + I/O + functional interfaces | Topic 5 + mixed sets |
| 4 | Concurrency + review + readiness | mixed sets + revision |
Open practice: /app/cloud/#/topic-selection/oracle_1z0-830