Please take them to a psychologist for a in-person IQ tests (not expensive just one hour). The IQ test is graded quarterly so ask when is the best day to take them is important. My daughter (US MD at 25 in surgery residency) got 99.7 percentile so I placed her in IB schools. Before high school graduation, ask them to take an online free career screening test to determine their career path options. Putting your children in the right peers/environment/atmosphere is very critical. Wishing you the BEST in single parenting and raising successful children 😇