The present disclosure provides compounds of Formulae I-A, I-B, II-A, II-B, III-A, III-B, IV-A, IV-B, V-A, V-B, VI-A, and VI-B, and compounds shown in Table 13, Table 13A, and Table 14, and pharmaceutically acceptable salts, solvates, hydrates, polymorphs, co-crystals, tautomers, stereoisomers, isotopically labeled compounds, and prodrugs thereof, which are GSK3 inhibitors. The present disclosure also provides pharmaceutical compositions, combination therapies, and kits comprising the compounds, and pharmaceutically acceptable salts, solvates, hydrates, polymorphs, co-crystals, tautomers, stereoisomers, isotopically labeled compounds, or prodrugs thereof, and methods of treating or preventing diseases and disorders associated with GSK3.