MATH 33B
Differential Equations
Lecture and discussion. The registrar has published a final exam time.
Fall 2026: 2 lectures and 12 discussions. 2 lectures and 8 discussions are open. The oldest of these readings was 57 minutes ago.
Grades
3.41
Average grade awarded in MATH 33B. Not a student rating: this is what the grades were.
In the A range
65%
of the 4,509 letter grades
D, F or W
5.7%
of every letter grade awarded, plus withdrawals
Taken pass/no pass
<1%
64% of those passed
The registrar's own records: 4,509 grades over 16 terms, Fall 2021 to Fall 2025. Every instructor is pooled here.
What is inside that record
4 of those terms are summer sessions, and summer sessions are counted here.
The table below splits them, and term averages across those 16 terms ran 2.83 to 3.85.
Historical grades for JOHNSON, CASEY LYNN, across recorded terms. The course summary above includes all professors.
No grade history is available for this professor in this course.
By instructor
| Instructor | Predicted GPA | Raw | n | Terms | A range | Workload | Fall 2026 |
|---|---|---|---|---|---|---|---|
| WANG, CHENGXI reviews ↗ | 3.80 | 3.81 | 1,215 | 4 | 88% | very light | not teaching it |
| MARSDEN, KATIE reviews ↗ | 3.07 | 3.06 | 761 | 3 | 49% | very light | not teaching it |
| MIN, HYUNKI reviews ↗ | 3.83 | 3.85 | 400 | 1 | 89% | very light | not teaching it |
| MUNOZ, SEBASTIAN reviews ↗ | 3.33 | 3.33 | 391 | 2 | 59% | - | not teaching it |
| ROPER, MARCUS LEIGH reviews ↗ | 2.75 | 2.72 | 366 | 4 | 35% | heavy | not teaching it |
| PALMER, AARON Z reviews ↗ | 3.39 | 3.39 | 204 | 1 | 55% | - | not teaching it |
| ZHAO, ZIWEN reviews ↗ | 3.43 | 3.43 | 196 | 1 | 55% | - | not teaching it |
| GLEIZER, OLEG reviews ↗ | 2.95 | 2.90 | 188 | 1 | 37% | - | not teaching it |
| MAIMAITIYIMING, WUMAIER reviews ↗ | 2.87 | 2.82 | 187 | 1 | 36% | very light | not teaching it |
| ACEVES SANCHEZ, PEDRO reviews ↗ | 3.62 | 3.64 | 183 | 1 | 78% | - | not teaching it |
| PALMER, AARON ZEFF reviews ↗ | 3.74 | 3.77 | 181 | 1 | 85% | - | not teaching it |
| NEGRINI, ELISA reviews ↗ | 3.41 | 3.41 | 132 | 1 | 62% | very light | not teaching it |
| GREENE, ROBERT E reviews ↗ | 3.24 | 3.21 | 105 | 2 | 55% | - | not teaching it |
Why Predicted is not the Raw average
“Predicted” is shrunk toward the course average, which is itself shrunk toward the department, so an instructor with a handful of students sits near the course mean rather than topping the list.
Grade records describe outcomes. For what a course is like to take, read student reviews written on dibs below or follow the separate external review link.
Workload and assignments
Work types reported in BruinWalk reviews of this course, across recorded instructors and terms. They may differ from this term's syllabus.
dibs has not read this course’s reviews, so it cannot say what kind of work it sets. That is dibs not having looked. It is not a course without papers or exams, and the reviews linked below are the answer until dibs catches up.
What comes first
The chain dibs can see is 3 courses long before MATH 33B. dibs has read a class page for every course in it.
Counted in courses rather than quarters: dibs does not know which of them a department lets you take together.
In Falls
Ran in 5 of the last 5 Falls.
From the terms dibs holds, which start in Fall 2021 and exclude summer. A department can run a course in a quarter it never has before.
From the registrar's catalog
Lecture, three hours; discussion, one hour. Enforced requisite: course 31B with grade of C- or better. Highly recommended: course 33A. First-order, linear differential equations; second-order, linear differential equations with constant coefficients; power series solutions; linear systems. P/NP or letter grading.
Sections in Fall 2026
You enroll in the discussion, not the lecture, so a discussion's status is the one that decides whether you get in. A lecture can read open while every discussion under it is full.
Seat counts as of : the oldest of these 14 readings. Seat readings are snapshots, not live availability. Their timestamps show when dibs last checked.
-
Lec 1 MWF 9:00am-9:50amOpen
Ji, S.
3.41predicted, all instructors · 4,509 grades16 seats left. 194 of 210 enrolled medium risk
6 discussions, 5 open.
Every discussion, with its time and seats (6)
-
Dis 1A
T 9:00am-9:50am · Boelter Hall 5273
Waitlist0 of 3 places taken.
35 of 35 enrolled
-
Dis 1B
R 9:00am-9:50am · Boelter Hall 5273
Open2 seats left.
33 of 35 enrolled
-
Dis 1C
T 9:00am-9:50am · Physics and Astronomy Building 2748
Open4 seats left.
31 of 35 enrolled
-
Dis 1D
R 9:00am-9:50am · Physics and Astronomy Building 2748
Open1 seat left.
34 of 35 enrolled
-
Dis 1E
T 9:00am-9:50am · Bunche Hall 3164
Open5 seats left.
30 of 35 enrolled
-
Dis 1F
R 9:00am-9:50am · Bunche Hall 3164
Open4 seats left.
31 of 35 enrolled
-
-
Lec 2 MWF 2:00pm-2:50pmOpen3.41predicted, all instructors · 4,509 grades
17 seats left. 193 of 210 enrolled medium risk
6 discussions, 3 open: Dis 2C, T 2:00pm-2:50pm, Dis 2D, R 2:00pm-2:50pm, and Dis 2F, R 2:00pm-2:50pm.
Every discussion, with its time and seats (6)
-
Dis 2A
T 2:00pm-2:50pm · Mathematical Sciences 5138
Waitlist0 of 3 places taken.
35 of 35 enrolled
-
Dis 2B
R 2:00pm-2:50pm · Mathematical Sciences 5138
Waitlist0 of 3 places taken.
35 of 35 enrolled
-
Dis 2C
T 2:00pm-2:50pm · Boelter Hall 5264
Open3 seats left.
32 of 35 enrolled
-
Dis 2D
R 2:00pm-2:50pm · Boelter Hall 5264
Open9 seats left.
26 of 35 enrolled
-
Dis 2E
T 2:00pm-2:50pm · Mathematical Sciences 5137
Waitlist0 of 3 places taken.
35 of 35 enrolled
-
Dis 2F
R 2:00pm-2:50pm · Mathematical Sciences 5137
Open5 seats left.
30 of 35 enrolled
-
Final enrollment, averaged across each term's sections: between 130 and 210 a term over 12 terms, summer excluded, most recently 201 in Fall 2025. That is the shape across years, not this term, which is above.
From the people who took it
Student reviews
What taking MATH 33B was like: the work, the teaching, and what students wish they’d known.
Your experience could be the first.
No student reviews are available to read on dibs for this course yet. Took it? Tell the next person what helped, what was hard, and how you spent your time.
Looking for more perspectives?
External reviews are separate and do not count toward the dibs rating.
Seats over time in Fall 2026
How each lecture has filled since dibs first saw it. This course runs 2 lectures; the legend under the chart picks one.
A dot is a reading where something moved: the seat count, the status, or the waitlist.
What a flat run means, and where a line starts
Flat between dots means it did not drift, it held and then jumped, and a line starts when dibs first saw that lecture rather than reaching back before it existed. A lecture that has never moved draws a flat line across the whole window, and one with two or three readings draws a line joining them, which is too few to read a trend from.
Lec 1 · Ji, S. · 194 of 210 enrolled
Filled by 2 over about 2 months
Lec 2 · Johnson, C.L. · 193 of 210 enrolled
Filled by 2 over about 2 months
How readings and alerts work
A reading and an hourly record are different things, and most charts here hold more of the second missing than present. dibs has taken readings of a section since long before it began keeping an hour-by-hour log of when it looked, so the empty stretches are dibs saying it was not keeping that log yet, not that it looked and found nothing. That is the age of the record and not a fault.
Seat counts show the last successful read, not live availability. Refreshes can be delayed by request limits or upstream interruptions. Watched sections receive priority, but an hourly update for every section is not guaranteed.
The registrar can change a seat count between our checks. Alerts depend on dibs detecting an opening and completing delivery; a quiet watch does not prove that no seat opened. Check the registrar before enrolling.