hi,

see to achieve a high score you have to start preparation almost 1 year before  for exams like neet ug, jee main etc. neet ug exam questions are mcq type, questions can be make from any of the chapters for the subjects of physics, chemistry, biology. total marks is 720. so securing 670+ means to secure more than 90% score in each of the subject. however right now you have to do lots of practice of mcq questions. daily attempt small subject wise or chapter wise test.

now coming to time management, make a routine for your daily works and study time. since only few times left for exam as per previous years schedule, you have to revise the three subjects daily. make short notes for the before exam day revision. be confident and dont waste your time on thinking too much about how much score you may answer. just remember what you have studied and before answering the questions  read it carefully and detect what the answer expected from you.

careers360 has neet online coaching for students which includes lecture series, mock test, previous year solve papers etc. follow the link to boost your neet ug preparation:

https://learn.careers360.com/