firstly in board exams, you should more concentrate on your studies and there are no more different tips and tricks because in every exam you have to do the same preparation like
if you are not concentrating your studies so you must watch motivational videos.
if you have doubt something in any subjects instead of coaching u should watch online tutorials it is very helpful and you can easily understand the things.
the schedule should be tight at least 6-7 hours you have to put on your studies or if you have weak in any subjects so you take more type in weak subjects.
always make proper notes in exams days
so these are the tips and tricks that can anyone use on exams days and you can get easily 98% on your board's exams.