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NJ's 12-college system holds the deepest prereq chain in the dataset — 31 levels from ESL 037 to NUR 216. ENG 087 gates 727 courses.

MI's ACRD 080 gates 710 downstream courses — more than any English course. Reading is the prereq for math, which is the prereq for nursing.

Ohio's IDS 102 gates 231 downstream courses — more than any English course. The deepest chain reaches 16 levels through nursing's lec-lab-clinical.

Course codes look the same across states but mean different things. Decode the prefix, level, and suffix — and why the catalog beats the code.

SDV 100 is a 1-credit required course at DCC covering study habits, time management, and academic planning. Who must take it and how it transfers.

BIO 101 at DCC: 4 credits, lecture + lab, no prereqs, 13 sections per term. Direct-match transfer to every VA public university.

EXSC 240 at Frederick CC: 3-credit hybrid course bridging exercise science to applied work. Direct-match transfer to UMD KNES 214.

Across TCSG's 22 colleges, developmental English and reading sit at the base of prereq chains for 1,400+ downstream courses. How to sequence them.

Across MD's 16 CCs, ESOL and developmental English gate 400+ courses. Surgical Tech and nursing chains run 14 levels deep — how to sequence them.

Across NCCCS's 58 colleges, ACA 085 and developmental English gate 900+ downstream courses. Nursing and EMS chains run 15 levels deep.

Across SCCTCS colleges, RDG 100 and developmental English gate 460+ downstream courses. The nursing chain runs 21 levels deep — sequence carefully.

At Del Tech, SSC 100 sits upstream of 606 courses — more than any English or math prereq. Engineering and MLT chains reach depth 9.

Across MA CCs, ENG 109 and related developmental courses gate 400+ downstream courses. Nursing chains reach depth 13. English is the planning variable.

RI has one CC — CCRI. ENGL 0700 gates 262 downstream courses; the nursing chain runs 21 levels deep. How to sequence with no alternative campus.

Across CUNY's 7 CCs, max prereq chain depth is 8 — far below FL and SC's 21–22 levels. Co-requisite remediation explains the ceiling.

At CCP and across PA, FNMT developmental math — not English — drives the deepest chains. BMET reaches depth 12; DMI reaches depth 11.

UDC Community College is DC's sole CC. 100% of indexed courses carry explicit prereqs. MATH 151 gates 149 courses; architecture reaches depth 7.

Across CT State's 12 campuses, ENG 0930 gates 200 downstream courses despite a max depth of only 5. Music, CMGT, and CSC chains run deep.

CCSNH's prereq structure is broadly shallow, but Radiologic Tech (RADT) chains reach depth 8 — the deepest in the system. Only 78 deep chains.

Across TBR's 12 CCs, ENGL 1010 gates 64 downstream courses. But CITC 1301 gates 31 — the non-obvious bottleneck. Agriculture chains reach depth 8.

VCCS's max prereq depth is 4 — the shallowest in any multi-college system we've indexed. Only 19 deep chains across 292 prereq-bearing courses.

VTSU merged CCV, Johnson, Lyndon, and Castleton in 2022. CIS 1100 and MAT 0310 tie as top bottlenecks at 15 each; STEM chains reach depth 5.

ENC 0025 gates 319 downstream courses in Florida's FCS — the system's most consequential course. The nursing chain reaches 22 levels deep.

Across 12 states, 40–60% of CC courses have a prereq, and chains go 4+ levels deep. How to spot them before you register, with real catalog data.

Online completion rates run 10–15% lower than in-person. Hybrid still has mandatory attendance days. Compare real completion data, workload, and schedule flexibility before you choose a format.