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Log inJoin now for freeBoost your grades with AI marking + feedback on past paper questionsBoost your grades faster with AI marking + feedback on past paper questions and more.Get started - for free!Markscheme breakdown✅PC points to next instruction; increments unless branching✅Address copied to MAR; instruction fetched into MDR✅Control unit decodes instruction✅Execution uses registers/ALU; accumulator holds resultsAssistant is typing…✓✓✓✓✓✓6 / 6On each cycle the program counter (PC) points to the next instruction. The address is copied into the MAR and the instruction at that address is fetched from memory into the MDR. The control unit decodes the instruction to determine the operation and required operands. During execution, data moves between registers and ALU as needed, with the accumulator holding intermediate results. Finally, the PC is incremented (or updated on a branch) and the cycle repeats.On each cycle the program counter (PC) points to the next instruction. The address is copied into the MAR and the instruction at that address is fetched from memory into the MDR. The control unit decodes the instruction to determine the operation and required operands. During execution, data moves between registers and ALU as needed, with the accumulator holding intermediate results. Finally, the PC is incremented (or updated on a branch) and the cycle repeats.DeletePainless past paper practiceImprove faster with marking + feedback on past papers.Master the contentMaster your course A-Z with fun and engaging quiz questions.Everything you need for A Level successExam-style questionsThousands of past paper questions organised by topic for you to practice with.Instant AI markingSkip the hassle of finding markschemes and deciding whether to award yourself this or that mark.Examiner-like feedbackGet a breakdown of the positives and negatives of your answer and how it compares to the markscheme.Recall questions by topicThousands of recall questions covering your course A-Z. Simply flip a card to follow up with your AI tutor.Detailed analyticsGraphs and charts display your performance over time, by topic, time spent revising and more.Tried and testedA Level students ❤️ love Alevels.aiAlevels.ai has become a helpful part of my revision. I appreciate how it immediately highlights areas where my answers need improvement.ChisomThe way everything is in one place makes revising so much less overwhelming. Everything is clear and well-organised.KiruThe AI marking just gives me extra confidence and it's easy to see what I'm doing right and wrong.LiamFAQsIs it free?Is the AI tutor accurate?Can I use it on my phone?Is the AI marking accurate?Can I do multiple subjects on Alevels.ai?What do the analytics show?Have a different question?Contacthello@alevels.aiLegalTerms and conditionsPrivacy policyNot affiliated with AQA, Edexcel, OCR, IB, CIE or Cambridge in any way.Copyright © 2025 Alevels.ai All rights reserved.SubjectsOCR ChemistryOCR PhysicsOCR BiologyOCR Computer ScienceResourcesGrade boundaries