IR, IL and US are a good combo. You will definitely dive into the deep end of the knowledge pool.
Punjabi is good, language subjects often prove to satisfy their authors.
Another 'swing' subject choice could be Gender Studies (+ paired well with sociology) or philosophy whichever itches your interest.

Start your note writing and have a go at 3 past papers; Only pursue academies if you have a lot of time to spare or are extremely unsatisfied with your learning ways. I think the only good that comes from academies are their mock exams/mock interviews. Everyone has a different rhythm of learning.
Just read ALOT, essays, newspapers, magazines and articles - will grip your mind with good vocab and writing styles - then practice a bit of essay writing.

Good Luck!

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"He who has a why to live for, can bear almost any how." (Friedrich Nietzsche)