Is note taking good? How good is OCR? Do you know if it works with other languages/alphabets (cyrillics)? Can it handle usual stuff used in formulas, subscripts

Is note taking good? How good is OCR? Do you know if it works with other languages/alphabets (cyrillics)? Can it handle usual stuff used in formulas, subscripts/superscripts, fractions, integrals, f : S³ → G, H⊲G ≡ ∀g∈G gHg⁻¹ = H and other weird symbols we use? How about stuff that comes with several columns/rows, like matrices? How about tables?