OSSD course planning: fitting 30 credits into a workable timetable
A course plan has to satisfy three things at once: the compulsory structure for graduation, the prerequisites of the target program, and the student’s current English and academic level. When they conflict, the order is graduation first, program second, average optimization last.
Five principles behind a good plan
Do not back-load
Grades 9 and 10 are lighter, which makes them the window for English and the foundational subjects. Pushing the difficulty into Grade 12 stacks the risk onto the one year whose marks matter most.
Back-plan the prerequisite chain
MCV4U needs MHF4U, which needs MCR3U, which needs MPM2D. Delay any link and the whole chain slips a semester — the single most common planning accident.
English before everything
English sets the ceiling on every other course: a student who cannot parse the question cannot show their math. Concentrate the ESL stage rather than dragging it alongside core subjects for three years.
Keep swappable slots
Directions change. Keeping one or two courses that count either way in Grade 11 — MDM4U or ICS3U, for instance — means a change of direction does not restart the plan.
Be realistic about load
Four courses a term is the normal rhythm, and contests, testing and activities fill what remains. Before adding a course, ask whether the existing ones still hit their target marks.
The five ESL levels
The entry assessment sets the starting level. The IELTS column below is an indicative reference to help families locate themselves, not an official conversion.
| Level | Course code | Indicative band | What this level builds |
|---|---|---|---|
| Level A | ESLAO | Below IELTS 4.0 | Classroom survival language and basic literacy |
| Level B | ESLBO | IELTS 4.0-4.5 | Everyday expression and paragraph writing |
| Level C | ESLCO | IELTS 5.0 | Academic vocabulary begins; structured writing |
| Level D | ESLDO | IELTS 5.5 | Academic reading and argumentative essays |
| Level E | ESLEO | IELTS 6.0-6.5 | The academic English that bridges into ENG3U |
ESL credits count as electives; part of the four compulsory English credits can typically be met by ESLDO and ESLEO, with the rest coming from ENG3U, ENG4U and similar.
A typical STEM course map
| Grade | Math | Science | English and others |
|---|---|---|---|
| G10 | MPM2D Grade 10 math | SNC2D Grade 10 science | ESL at level or ENG2D, plus civics and career studies |
| G11 | MCR3U Functions | SPH3U physics and SCH3U chemistry, or SBI3U biology | ENG3U and ICS3U introduction to computer science |
| G12 | MHF4U advanced functions and MCV4U calculus and vectors, optionally MDM4U | SPH4U physics with SCH4U chemistry or SBI4U biology | ENG4U and ICS4U computer science |
Engineering requires MCV4U and SPH4U, usually with SCH4U; for computer science, ICS4U is a strong signal though not always a hard requirement.
A typical business and humanities map
| Grade | Core | Direction | English and others |
|---|---|---|---|
| G10 | MPM2D math, SNC2D science | BBI2O introduction to business | ESL at level or ENG2D, plus civics and career studies |
| G11 | MCR3U Functions | BAF3M accounting, BMI3C marketing | ENG3U and a social-science elective |
| G12 | MHF4U advanced functions, MDM4U data management | BBB4M international business, BOH4M leadership, CIA4U economics | ENG4U plus further 4U electives |
Business programs generally accept MDM4U as the math credit; the most selective — Ivey AEO, Rotman — add supplementary applications and higher averages.
Completion paths by entry grade
01
Entering in Grade 10 · about 3 years
Year one concentrates ESL and the Grade 10 compulsories, year two moves into Grade 11 U-level courses, and year three completes the six Grade 12 U/M courses. The most comfortable pace, with real room for contests and activities.
02
Entering in Grade 11 · about 2 years
ESL runs alongside the Grade 11 core, with Grade 12 completed in year two. Watch the chain: MCR3U must land in year one, or MHF4U and MCV4U slide into a third year.
03
Entering in Grade 12 · about 1 year
A summer of Grade 11 prerequisites and ESL, then the six 4U/M courses within the school year. There is no slack on this path; it suits students already at ENG3U level with a solid academic base.
How a mark is actually built
A course mark is typically 70% term evaluation — assignments, quizzes, lab reports, group projects, presentations — and 30% a final evaluation, which may be an exam, an essay or a culminating project. A dozen-plus graded moments a term, each one landing in the final number.
For students arriving from a Chinese-curriculum school, the adjustment is rarely the content — it is how marks are lost. Late submission, wrong format and sloppy citation each cost points where the previous system might only have issued a reminder. Building submission habits in the first two months raises marks more than extra practice does.
Common questions
How many courses can be taken at once?
Four is standard. Students accelerating add summer or evening courses, but past five at once the odds of marks slipping rise sharply — confirm the current courses are steady before adding another.
Can the direction change mid-way?
Yes, and the cost depends on how late. A Grade 11 change usually only reshuffles electives; a Grade 12 change often means a missing prerequisite and a summer or an extra semester to fill it.
Do universities see a repeated course?
The Ontario transcript shows repeats. Most universities count the highest mark toward the Top 6, but the policy is each school’s own — some, and some competitive programs, read every attempt. A pattern of repeats certainly gets read, and passing well the first time is far cheaper than planning to repeat.
Are online credits treated differently?
No — the transcript carries the same course code and credit, provided the school is inspected and credit-granting. Ontario’s own graduation requirements include at least two online credits.
More planning topics
One consultation, one clear route
An advisor turns this topic into your family’s own timeline — grade, marks and goals included.