My feeling

This afternoon, I took the Toiec Examination. While I have not reached a high band I felt very happy because I can know how to develop my ability.

(Take is present tense, I will take the exam or I took the exam, took is past tense. I is always capital when used singularly. However is used when connecting two related but sometimes conflicting sentences. Capacity means size, how big something is, can be used as a synonym for ability but it is not used often. Your ability to write correct spelling and grammar coming along well, keep up the good work.)