Yes, you definitely can prepare for boards without any coaching. it is not compulsory to join coaching. if If your target is to get good percentage then SELF STUDY is the sole weapon! Here are a few tips to help you: 1. Finding the time to study:The most important criterion is dedicating a major chunk of your day to studying. You cannot suddenly jump to studying for 9-10 hours a day if you were studying 3-4 hours earlier. You will find it too big of a change and will get distracted easily. So, move slowly and steadily until you reach at your target.2. Effective time management:After you have learned how to find the time to study, the next aspect is managing this time efficiently. A proper strategy to start would be studying with complete concentration, no disturbances, and continuously for 3-hour sessions. The idea is to simulate real exam conditions. While studying, you have to create an atmosphere of sitting in an examination hall. Setting a time-tableNow that the main criteria is covered, prepare a time-table. You can choose your own time table to prepare for all the topics of class 12, and if you are preparing for an exam like JEE you can also include those topics in your schedule. It all depends on what suits you best, and which topics you would like to cover first, second or third, based on your comfort levels. Try and figure out which topics are difficult for you, and work on dedicating some more time to those topics, so that you can improve. You can refer to the previous year’s JEE and board questions.Practice, practice, practice:Practice a lot in these months. Don’t undermine your CBSE NCERT books, as they are the best to practice with. Don’t overdo the practicing from heavy reference books, but instead ensure you first master the prescribed syllabus textbooks. Solve old question papers, take mock-tests and quizzes, and ask your seniors for some tips in mastering the tricky areas. The more you practice, the better you’ll get. It’s no wonder that they say ‘Practice makes perfect’!You will see that doing all these things is not really tough if you are really dedicated and adopt a never say die attitude. So go forth and conquer those exams with a rigorous self-study program.?

Self study from best books & Order some video classes dvd /pd if you want, You can also watch some youtube lectures, and make sure to revise them atleast 3 times :)