Hello,
For aptitude, there are tricks for some sections and Some are basic rules. The only way to gain skills is to practice harder. Harder in terms you understand how to solve the question accurately which is 1st priority and 2nd priority to limit time.
Use question bank of RS agarwal S.Chand as it provides good question set. There are online sites which provides mock tests appear them so that you can check weak sections and give more focus on it.
On the part of english, some chapters have rule and some have tricks and some is common sense. So you have to practice and hold patience as the questions are quite lengthy and big.
Hope it helps!
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