I am also an aspirant and preparing for job exams. I had a lot of issues in Maths portion. Now, honestly speaking, I have solved all the questions from past papers and the material given at the end of FPSC Papers by imtiaz Shahid.
I am highly indebted to Sir Chandarhass for his valuable youtube lectures. He has a firm grip on all the topics and solves the questions by using various methods. I strongly recommend his channel to all of you for exam preparation.
Good Luck everyone.

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جب خشت بنے تب کام چلے