To get SPA, you have to get your basics clear in mathematics. My advice is to do all the ncert questions of maths understanding the importance of each step of solution but dont only limit yourself to ncert and try a bit of iit level questions (dont need to master them, but understanding the advanced questions makes you clear the basics easily).
Dont be worried as the level of questions asked is not to high..just get your basics VERY CLEAR….
Regarding logical reasoning questions, they are to be performed out when you confront them, dont waste time trying out those sorts of questions for too long…
Best of luck for your preparation.