I fixed your spell. 

Grimtakrin's Prediction

Casting Time: 1 Action

Range: Self

Components: V, S, M (A red string)

Duration: Concentration, up to 1 minute

Classes: Bard, Cleric, Wizard

Choose one target within 30 feet of you that you can see. You are able to predict that creature’s movements and attack rolls the moment before they make them. As a bonus action while this spell is active, you can divine the creature’s movements until the start of your next turn. When you do this the creature has disadvantage on all attack rolls against you and saving throws you force it to make and you have advantage on all attack rolls you make against it and all and saving throws it forces you to make. 

At Higher Levels. Whenever you cast this spell at level 4 or higher, the duration of the spell extends for another minute for each spell slot level above 3rd.

Yeah... I think that might be an improvement. Just a tad.

I think this guy has way too much vague wordings.

amogus ding ding ding ding ding ding ding. didi ding.