Creo que ambas son incorrectas. ''Me olvidé de todo que estudié'', falta el antecedente de que. ''Me olvide de todo lo que estudié'' lo'' hace función de CD y no puede ser ''la'' porque todo es masculino

I recommend  you go to an autonomous community where Spanish is well understood, I wouldn't recommend Andalucia or Murcia as difficult to understand his accent. If you want to get the best advantage don't go to the communities of Cataluña, Valencia, Galicia and País Vaco because they have another co-official language and they don't use much Spanish as in other autonomous communities. The best option would be the Community of Madrid, exactly the city of Madrid. Don Quijote is a good website to look so put Madrid in the search box and choose the course that suits you. Don't do private lessons because it's better to be in a group: you make friends and learn faster. In addition the city of Madrid is very large and you can visit many sites, there are also many foreigners who want to learn Spanish like you.

IMPERFECTO (INDICATIVO) USES: 1) To describe a situation in the past. Ex: A Rubén le encantaba el fútbol 2) An action that was repeated in the past. Ex:Ella siempre se acababa su comida 3) To emphasize the extension in time of an action. Ex: Yo viajaba a Canadá INDEFINIDO USES: 1) An action taking place at a certain time in the past and already finished. Ex: El año pasado llegó una chica nueva a clase 2)A new action in the past that takes place in the middle of another action. EX: Justo cuando empezábamos a ser amigos de verdad, TUVO que marcharse. PLUSCUAMPERFECTO (INDICATIVO) USES: 1) An action taking place before a certain time in the past. Ex: Yo no HABÍA TERMINADO de contestar todas las preguntas del examen, en el momento en que sonó la campana. I know i'ts difficult and confusing but if you read and practice you will get used to it and your mind will form the structure in your head without thinking

Firstly, we don't say 'Los niños van a ensuciar a todo' we say ' Los niños van a ensuciar todo' and it translates like The kids are going to get dirty everything' or 'the kids are going to mess around. The point is we do'nt use preposition in this case. A TODO: is like 'to all'. Example: A todo el mundo---- To all the world DE TODO: is like 'of everything'. Example: De todo un poco----- A little of everything

Se dicen los dos: tomar un descanso---- Yo necesito tomar un descanso, yo voy a tomar un descanso tomarse un descanso------ (es un verbo reflexivo entonces el se de tomarse tienes que concordarlo con la persona del sujeto) yo me tomo un descanso tu te tomas un descanso él se toma un descanso nosotros nos tomamos un descanso vosotros os tomáis un descanso ellos se toman un descanso También se puede decir voy a tomarme un descanso o necesitas tomarte un descanso. En cocnclusión ambas formas son correctas solo tienes que tener en cuenta la concordancia del pronombre reflexivo (me, te, se, nos os, se)