Create a Realistic One-Week Study Plan Under Competing Time, Energy and Review Constraints

You will act as a careful study planner. Use only the details I give below. Do not invent real events, people, or facts.

My inputs:
Biology, Algebra, History
Monday, 23 November 2026
Monday-Friday: 3, Saturday: 6, Sunday: 4
High: 7:00-9:00 and 17:00-20:00. Low: 13:00-16:00. Moderate elsewhere.
Dentist appointment Tuesday 15:00-16:00; family dinner Sunday 18:00-19:00; buy lab notebook Saturday 10:00-11:00
Each subject must have one review session at least 48 hours after the last new study session for that subject. No subject can be studied for more than 90 minutes in a single block.
Complete one practice test for each subject and leave Sunday after 18:00 free before Monday's exam.

Your tasks:
1. Build a seven-day study plan from Monday to Sunday. Use the seven calendar days immediately before the exam date. Treat the exam date as outside the plan.
2. For each day, list every study block with a start time and end time. The total scheduled study time for a day must not be more than the hours available for that day.
3. Schedule every must-do task at its exact time. Do not move, shorten, or overlap these tasks.
4. Use the energy pattern: place the hardest subject or practice test in a high-energy window. Avoid scheduling new difficult material in a low-energy window if an alternative exists.
5. Follow the review constraints exactly. Show the date and hour gap between a subject's last new study session and its review session.
6. If any constraints conflict, stop and explain the conflict clearly. Propose the smallest change to one input that would resolve it. Do not silently break a rule.
7. End with a constraint-check table with one row per day: day, total scheduled hours, available hours, energy mismatch warnings, missed must-do tasks, and review spacing notes.
8. If the plan cannot fit all subjects and tasks, say exactly which input to change and why.

If the constraints are feasible, provide the complete seven-day schedule and constraint-check table. Do not stop after checking dates, totals, or feasibility, and do not describe consistent constraints as a conflict. An unspecified preference that does not prevent a valid plan is not a blocker; proceed using the provided information and briefly note any necessary assumption.

# Study Plan: Monday 16 Nov – Sunday 22 Nov 2026
(Exam: Monday 23 Nov 2026 — excluded from the plan)

## Assumptions (stated explicitly, no rules broken)
- **Hardest subject = Algebra** (not specified in input, so chosen for consistent high-energy placement per Rule 4). Biology and History are treated as moderate-difficulty.
- The 48-hour review gap is measured from the **end time** of the last new-study session for that subject.
- Daily hour caps are **maximums**, not quotas — days may be scheduled under-cap (e.g., for rest before the exam) without violating any rule.
- Fixed tasks (dentist, dinner, errand) are non-study commitments and are listed alongside study blocks for clarity but are never altered.

---

## Daily Schedule

### Monday 16 Nov — cap 3h
| Time | Activity | Energy |
|---|---|---|
| 7:00–8:30 | Algebra – new study (90 min) | High |
| 9:00–10:00 | Biology – new study (60 min) | Moderate |
| 10:00–10:30 | History – new study (30 min) | Moderate |

Total: 3.0h / 3h cap ✅

### Tuesday 17 Nov — cap 3h
| Time | Activity | Energy |
|---|---|---|
| 9:00–10:00 | History – new study (60 min) | Moderate |
| 10:00–10:30 | Biology – new study (30 min) | Moderate |
| **15:00–16:00** | **Dentist appointment (fixed)** | Low |
| 17:00–18:30 | Algebra – new study (90 min) | High |

Total study: 3.0h / 3h cap ✅ — Dentist unmoved, no overlap.

### Wednesday 18 Nov — cap 3h
| Time | Activity | Energy |
|---|---|---|
| 7:00–8:30 | Algebra – **new study #2 (last new session)** (90 min) | High |
| 9:00–10:00 | Biology – **new study #2 (last new session)** (60 min) | Moderate |
| 10:00–10:30 | History – **new study #2 (last new session)** (30 min) | Moderate |

Total: 3.0h / 3h cap ✅

### Thursday 19 Nov — cap 3h
*(Too early for any review — 48h not yet elapsed for any subject; used for buffer/consolidation practice, not new difficult material.)*
| Time | Activity | Energy |
|---|---|---|
| 7:00–8:00 | Algebra – consolidation practice (60 min) | High |
| 9:00–10:00 | Biology – consolidation practice (60 min) | Moderate |
| 10:00–11:00 | History – consolidation practice (60 min) | Moderate |

Total: 3.0h / 3h cap ✅

### Friday 20 Nov — cap 3h
| Time | Activity | Energy | Gap check |
|---|---|---|---|
| 10:00–11:00 | Biology – **Review session** | Moderate | Last new ended Wed 10:00 → review starts Fri 10:00 = **48h exactly** ✅ |
| 11:00–11:30 | History – **Review session** | Moderate | Last new ended Wed 10:30 → review starts Fri 11:00 = **48.5h** ✅ |
| 17:00–18:30 | Algebra – **Review session** | High | Last new ended Wed 08:30 → review starts Fri 17:00 = **56.5h** ✅ |

Total: 3.0h / 3h cap ✅

### Saturday 21 Nov — cap 6h
| Time | Activity | Energy |
|---|---|---|
| 7:00–8:30 | Algebra – **Practice test** (90 min, hardest subject → high energy) | High |
| 9:00–10:00 | Biology – Practice test (60 min) | Moderate |
| **10:00–11:00** | **Buy lab notebook (fixed)** | Moderate |
| 11:00–12:00 | History – Practice test (60 min) | Moderate |

Total study: 3.5h / 6h cap ✅ (2.5h left unscheduled as rest buffer) — Errand unmoved, no overlap.

### Sunday 22 Nov — cap 4h, must be free of study after 18:00
| Time | Activity | Energy |
|---|---|---|
| 7:00–8:00 | Algebra – final light review (60 min) | High |
| 9:00–9:30 | Biology – final light review (30 min) | Moderate |
| 9:30–10:00 | History – final light review (30 min) | Moderate |
| **18:00–19:00** | **Family dinner (fixed)** | High |
| 18:00→end | **Free — no study** (per Rule 8) | — |

Total study: 2.0h / 4h cap ✅ — all study finished by 10:00, well clear of the 18:00 cutoff; dinner unmoved.

---

## Review Spacing Summary

| Subject | Last new session ends | Review starts | Gap |
|---|---|---|---|
| Algebra | Wed 18 Nov, 08:30 | Fri 20 Nov, 17:00 | 56.5h ✅ |
| Biology | Wed 18 Nov, 10:00 | Fri 20 Nov, 10:00 | 48.0h ✅ |
| History | Wed 18 Nov, 10:30 | Fri 20 Nov, 11:00 | 48.5h ✅ |

All reviews meet or exceed the 48-hour minimum. No block exceeds 90 minutes for any subject.

---

## Constraint-Check Table

| Day | Scheduled Hours | Available Hours | Energy Mismatch Warnings | Missed Must-Do Tasks | Review Spacing Notes |
|---|---|---|---|---|---|
| Mon 16 Nov | 3.0h | 3h | None | None | N/A (no review yet) |
| Tue 17 Nov | 3.0h | 3h | None | None | N/A |
| Wed 18 Nov | 3.0h | 3h | None | None | Last new sessions for all 3 subjects set here |
| Thu 19 Nov | 3.0h | 3h | None | None | N/A (gap still accruing) |
| Fri 20 Nov | 3.0h | 3h | None | None | Biology 48.0h, History 48.5h, Algebra 56.5h — all satisfy ≥48h |
| Sat 21 Nov | 3.5h | 6h | None | None | N/A (post-review practice tests) |
| Sun 22 Nov | 2.0h | 4h | None | None | N/A; all study ends by 10:00, satisfying "free after 18:00" rule |

**Totals:** 20.5h scheduled study out of 25h available (within all daily caps).

---

## Feasibility Statement
All constraints are mutually satisfiable with the given inputs — **no conflict exists**, and no input change is required. The plan:
- Keeps every fixed appointment exactly as specified, with no overlap or shortening.
- Respects the 90-minute per-subject block limit throughout.
- Places the hardest subject (Algebra, per stated assumption) exclusively in high-energy windows.
- Avoids the low-energy window (13:00–16:00) entirely for study, since moderate/high alternatives were always available.
- Satisfies the ≥48-hour review gap for all three subjects with explicit hour counts shown above.
- Delivers one practice test per subject (Saturday), with the hardest subject's test in the high-energy morning slot.
- Leaves Sunday fully free of study after 18:00, preserving the fixed family dinner and pre-exam rest time.