It’s a good thing when a person know his limitation on certain subject. You still in the youth of learning English don’t worry about that, just give it time & you will be their one day. These kind of things happened to all of us, it’s only matter of time and progression.

About the TOEFL IBT maybe it’s still early for you, but it’s a good experience if you try it between now and then it gives you a good way of learning. The TOEFL IBT you can book your test through the official TOEFL IBT website. You can select the place & time for the test. For me I took it on the CHAMBER OF COMMERCE in Dammam two years ago.

The introduction of linguistics I was planning of taking it, but I couldn’t because of the hour’s limitation. Good luck.