Hello, everyone! Before, I start, I would like to introduce myself. I'm a 15 years old guy and I live in Hyderabad, Sindh, with that being said, I would like some advice from people who have been in this field much longer than I have. I didn't have any interest in Central Superior Services or studies in general before. Lol. It all started when my relatives started to compliment my English skills, they'll be like "JUST BE AWARE OF WHAT'S GOING IN THE WORLD RIGHT NOW THERE'LL BE NO WAY YOU'LL FAIL". I understand the fact that it's not that easy. However, I'm willing to work hard for it and I believe if I start at such a young age, I'll succeed, InShAllah. I've downloaded the English Grammar E-book by Wren & Martin, to further enhance my English vocabulary and English Grammar skills. Also bear in mind, that I'm very weak at subjects like Mathematics, Physics, World History e.t.c. English and Computer Science seems to be the only subjects I'm good at... I hope I will get some good advice from you guys. Always up for constructive criticism!

Asalam o Alaikum I was in your place some years ago 2009 to be exact. As from your post I can judge you have a notable command over English lanugage. Now you have mentioned the book in regards to grammar, the book you have mentioned is quite a reliable and easy to pick from book. My piece of advice would be not to impose on yourself rather collect information as if it is a normal daily activity for you. Some tips to stregthen your General Knowledge watch Current Affairs and Political TV Talk Shows. Read History, join Quora, talk to sensible people having knowledge. Make reading a habit "read what you like" you will enjoy reading rather that doing something that would be dull / monotonous. Watch English Movies, Drama Series those are tips regarding ways on which to foritfy your English. Math, Physics and World History, For Math & Physics khanacademy.org is the best resource as it is targeted more towards Matric and Intermediate level Mathematics. Physics Forum is a famous site reagrding Physics issues. You need to step-up now no one will feed you. You need to start researching and studying on your own along the way take guidance / advice from your seniors.