It all depends on the answer to the question "why?" :)
You can quickly figure out one topic and learn how to solve a certain type of problem in order to pass the test. Or master a minimum of concepts and actions needed in everyday life, for example, to navigate discounts / promotions / percentages. And you can develop analytical thinking just for fun with the help of games and applications on your smartphone.
You can do all this yourself or find like-minded people. For example, in Skysmart groups for parents (Facebook, VK, Instagram) and teenagers (VK, Instagram): here we solve interesting problems, share handy cheat sheets and cool facts about mathematics and explain its laws in a simple and understandable language.
For more serious tasks, for example, to prepare for the exam, it is better to contact a teacher who will draw up a lesson plan for you. For example, Skysmart offers preparation courses for exams and olympiads, special lessons on logic problems on various topics, and the complexity of the program is selected for each student depending on his level.
Read the "Millionaire Beginner's Guide" ... (laugh !!). There are of course NZT ("Areas of Darkness") and CPH4 ("Lucy") ... But dude, I hope you're not serious? It's just that you need to start reading the theory, i.e. for example: Take and prove all the formulas concerning the quadratic equation, then solve 20-25 problems on the topic and switch to the next topic. In this case, you need to find a good book ... I do not know what level of knowledge you have, but I advise you to study geometry, planimetry and stereometry (Google for help). Simultaneously study algebra with her relatives. With all this, start playing Chess (try to add the StockFish 7 engine to the program and play with it, understand how to enable the sorting of moves from best to worst ... With time you will understand what I mean, look for answers to the questions - in your favor)). After being ordained as a student of Albus Dumbledore, you can transgress to the implementation of the magic of logic, solve the problems of the "All-Russian Olympiad in Mathematics, for schoolchildren 1993-2006" and work miracles with the Friedrich Method (Train and train, do not be lazy! By the way, don't forget that reading alone will not develop your brain, so always eat healthy food and breathe correctly. Yoga is only a small part of a healthy lifestyle, the Chinese have long come up with Qigong - repeat the selected movements 3 times a day, you don't need much more. The speed of thinking develops with mnemonics and analytical exercises - try to learn at least 10 new definitions a day, strive to bring this number to 100, and also write, just everything that comes to mind and save, 10 sheets a day, whatever it is ... Name the file as you like ... When masterpieces start to turn out, do not consider yourself the smartest, because you are capable of much more. Try to study the emotional processes and take the trouble to slow them down or completely control them. All of this is closely related to the speed of progress and the depth of progress in the cognition of analytical thinking and constructive ordering of priorities in the brain. When you become an archmage, start watching anime, drama, TV series, movies, etc. - at the same time, install VLC for yourself and find how to speed up the video, try to get used to the high-speed perception of information and try to predict the future in the plot ... Then go to the wiki quote book and pull out winged phrases from there, dot everything in your head. No more time to write, good luck. I think you will understand what to do yourself.