GraphQL Quizzes (MCQs)Level 1 Foundations Schema & Basic QueriesIntroduction GraphQL vs REST, Graph Model, Operations01_INTRO SDL & Types Object Types, Scalars, Lists, Non-Null02_SDL Basic Querying Fields, Relationships, Root Query, Arguments03_QUERY Level 2 Intermediate Manipulation & DirectivesAdvanced Querying Aliases, Fragments, Variables, Op Names04_ADV_Q Mutations Writing Data, Return Values, Input Types05_MUTATE Directives @include, @skip, @deprecated, Custom Directives06_DIRECT Level 3 Architecture Resolvers & PerformanceResolvers Resolver Args, Context, Async execution07_RESOLV Polymorphism Interfaces, Unions, __typename handling08_POLY Performance N+1 Problem, DataLoaders, Complexity09_PERF Level 4 Production Mastery Security & EcosystemReal-Time Subscriptions, WebSockets, PubSub10_SUBS Security & Errors Depth Limiting, Rate Limiting, Partial Failures11_SEC Best Practices Caching, Pagination, Tooling, Apollo/Relay12_PRO