Trigonometry is only practice. No other way. start with SL Loney, do all problems, subjective also. Then move on to cengage, I would say. By the time you're done, you'd have all formulae on the tip of the tongue.
S block is again, just reading and memorizing. Do bit by bit everyday, solve problems so that you can test your learning.
About managing the time, I am not the best person to answer because I suck at it. I'm sure the others will guide you.
Also, get a grip on coordinate geometry at the earliest. You'll need to know everything perfectly to solve questions quickly.