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Some exams are paid from your wallet balance. Sign in, open the exam, tap Buy — the amount is deducted and your child can retake on that account.
Your balance unlocks paid exams and some features. Top up from the profile; promotions (if any) show at checkout.
Use Google/email sign-in. Don’t share passwords. Parents can share a device and sign out afterward.
About 15–25 minutes for elementary: one manageable exam, then a short break. You don’t need to sit beside them the whole time — see “For parents” on each exam.