Real-estate financing and the math the national salesperson exam actually tests. The instruments (promissory note vs mortgage vs deed of trust, lien vs title theory), the clauses (acceleration, due-on-sale, prepayment, subordination), loan types (conventional with PMI, FHA-insured, VA-guaranteed, ARMs, balloons, construction and blanket loans), foreclosure and redemption, the primary vs secondary mortgage market, and the consumer-protection layer (TILA/Regulation Z advertising triggers, RESPA and the Loan Estimate/Closing Disclosure, the kickback ban). Then the computed math: commissions and splits, LTV and points, prorations, transfer taxes, seller’s net proceeds, cap-rate and GRM valuation, and area problems — every answer computed, every wrong option a classic slip. Original questions aligned to the public national exam outlines — never real exam items. Keentune is independent study practice, not affiliated with any state real-estate commission or exam vendor, and does not guarantee a pass. Educational only — how the instruments and math work, not financial or investment advice.