CBG practice questions - frequently asked questions
Plain answers about how CBG Exam Prep works: the exam, the questions, pricing, the free trial, and what you actually get.
No - and you should be wary of any site claiming otherwise. Every question here is original, written to mirror the style, difficulty, and judgment the real CBG exam tests. Each one comes with a plain-language explanation of why the right answer is right and the others aren't.
The CBG exam spans 15 domains: Amino acids (15%) — PKU and hyperphenylalaninemia; Tyrosinemias; Glycine encephalopathy/hyperglycinemia; MSUD and disorders of branched-chain amino acids; Homocystinuria/disorders of sulfur amino acids and re-methylation; Urea cycle defects; Other/Serine; Organic acids (12%) — Methylmalonic acidemia (excluding cobalamin defects) and propionic acidemia; 3-MCC deficiency and other C5OH-related disorders including 3-MCC deficiency and other C5OH-related disorders; IVA and other C5-related disorders; Glutaric acidemia type I; Disorders of ketone body metabolism (HMG-CoA lyase, SCOT); Other including Glutathione synthetase deficiency, ECHS1, and 3-methylglutaconic aciduria non-type 1; Cofactors (7%) — Cobalamin; Biotin; Molybdenum; Folate; Pyridoxine; Biopterin; Other including riboflavin, niacin, and thiamine; Carbohydrates (10%) — Glycogenoses (except GSD II [see LSD]); Disorders of glycolysis; Disorders of gluconeogenesis including fructose-1,6-bisphosphatase deficiency; Disorders of Galactose metabolism; Disorders of fructose metabolism; Congenital disorders of glycosylation; Other including pentose phosphate; Lipids (13%) — Fatty acid oxidation disorders including short-chain, medium-chain, long-chain, and multiple acyl-CoA dehydrogenase deficiency (GA2); Hyperlipidemias including Tangier disease and other; Disorders of cholesterol metabolism including Smith-Lemli-Opitz, Niemann-Pick C, and other bile acid disorders; Lysosomes (12%) — Mucopolysaccharidoses including Type I, Type II, Type III, Type IV, Type VI, and Type VII; Sphingolipidoses including Gaucher disease, Fabry disease, GM2 gangliosidoses including Tay-Sachs disease and variants and Sandhoff disease, Krabbe disease, Niemann Pick types A and B, GM1 gangliosidosis, and other; Multiple enzyme deficiencies including Mucolipidoses ML-II and ML-III, Multiple sulfatase deficiency, and other; Other including Pompe, Cystinosis, and NCL; Mitochondria (7%) — Mitochondrial myopathies with laboratory findings; Mitochondrial myopathies with Leigh syndrome; Mitochondrial myopathies with adult presentations; Disorders of electron transport chain function and assembly; Mitochondrial DNA mutation disorders; Disorders of mtDNA maintenance; Mitochondrial DNA depletion syndromes; Other including MELAS; Peroxisomes (3%) — Biogenesis disorders including Zellweger syndrome; Single-enzyme disorders including X-linked adrenoleukodystrophy; Other including Refsum - infantile; Purines and pyrimidines (3%) — Purine disorders including Lesch-Nyhan disease, Adenosine deaminase deficiency, and other; Pyrimidine disorders including UMP synthase deficiency and other; Transport (3%) — Dibasic aminoaciduria including cystinuria and lysinuric protein intolerance; Other amino acid transport disorders; Glucose; Carnitine; Other; Creatine (1% of the exam); Neurotransmitters (2%) — Succinic semialdehyde dehydrogenase (SSADH) deficiency; Disorders of dopamine synthesis; Other including GABA metabolism; Metals (3%) — Copper including Wilson disease, Menkes disease, and other; Iron; Zinc; Other; Laboratory (8%) — QA/QC; Artifact; Techniques; Regulations; Other disease category (3% of the exam). Every practice question on this site is tagged to one of these domains.
1,000+ questions across all 15 CBG exam domains, mixing scenario-style multiple choice with true/false drills, each with a plain-language explanation.
Yes - the bank is maintained against the current exam outline, and questions are revised when the exam changes.
No honest practice platform can guarantee a pass. What realistic practice does is show you - before exam day - exactly which domains are weak, and give you the repetitions to fix them. That is the difference between hoping you're ready and knowing where you stand.
Yes - 10 free questions with full explanations, no card and no signup required. Start on the home page.
The free sample shows you the question quality. Paid plans unlock the full 1,000+ question bank, exam-style practice modes, mistake review, and (on Fast Track and Pass Confidence) progress analytics that show your readiness by domain.
No. Every plan is a single one-time payment for a fixed access window. Nothing renews, and no card details are stored for future charges.
Match it to your exam date: Final Review (2 days) for an exam in the next day or two, Fast Track (7 days) for an exam this week, Pass Confidence (6 weeks) for a structured run-up. See plans and pricing.
For most countries, the price you see is exactly what you pay - tax is already included. Where local law requires it to be added separately, it's shown clearly at checkout before you pay, so there are never any surprise fees.
Access is instant after payment and runs for your plan's full window from that moment. When the window ends, your local progress stays on your device - you can buy another window any time and pick up where you left off.
Yes - the whole platform is built mobile-first: practice, mistake review, and analytics all work on any phone, tablet, or laptop with a browser. Nothing to install.
Every answer feeds your per-domain accuracy, readiness score, and weak-area list. Instead of re-reading everything, you drill the domains that are actually costing you points - that's what moves a score in days, not months.
Make sure you're signed in with the same email you used at checkout - access activates within a minute of payment. If it still doesn't appear, email support@boardmentor.study and it will be sorted out.
Yes - 24/7 chat support, right from the chat bubble in the corner of every page: instant answers about plans, access, billing, and your prep. Prefer email? Write to support@boardmentor.study and a real person will reply.
CBG Exam Prep is an independent platform focused on CBG exam practice - not affiliated with the body that administers the exam. More on the about page.