sideways. Sidewise is correct.
so. Incorrect for so that.
Wrong. I want the money so I can go home.
Right. I want the money so that I can go home.
So should not be used alone to modify an adjective.
Bad. College life is so stimulating.
Better. College life is the most stimulating life of all.
strata. Plural, not singular.
tend. Use attend or take care of rather than tend.
Bad. I’ll tend to your case, young man, after school.