Question

حسین  تصمیم گرفت زبان انگلیسی را خودش بدون معلم یاد بگیره و به مدت سه ماه انگلیسی رو یاد گرفت و سطح زبانش رو به سطح مورد نیازش رساند

Answer 1

Hossein decided to learn the English language [alone]/[without anybody's help]/[on his own] and without (any) teacher and learnt/learned it through/in/during 3 months and increased/raised his language level to his desired/wanted/needed level.