I got 70% in class 12sci . can I prepare for Nda in 2 months if possible then what time table should I follow to crack the exam?

Yes, you can appear. Here are some preparation tips for NDA you can prefer:

Everyday 2-3 hours study is necessary on regular basis. Categorize the course as per your comfort and start preparing.
Practice previous year question paper as much as possible.
Reading monthly magazine prior to the date of exam will be helpful.
Time management is a key here, see how many questions you are able to answer in minimum amount of time.
When practicing previous papers think once before guessing on an option, since negative marking is implied here so every wrong answer will cost you extra 1 mark.
Learn shortcuts, avoid length calculation on paper do it in your mind.
Learn tricks, in mathematics on few questions answer can be brought up by looking at the options i.e. instead of solving the whole questions take the given options and solve the question around those options.
Watch good informative programs on TV, read extensively newspaper, magazines, journal etc.
Study in group, it help you in sharing the ideas and grasping the concepts quick.

Time table:
You need to give minimum 7 to 8 Hours to your study.

Study Maths 3.5-5 Hours DAILY. All Important topics likeTrignometry,Vectors,Integration,Limits,Differentiation and practice hard and maintain a copy of tricks/diary of mistakes.

GK(Dynamic)- 1.2 Hours Go through Just last 10 months competition magazines or you can look for online compilations also.Time saving plus Interesting part.
GK(Static)-1.2 Hours Go through NCERTS or Arihant pathfinderPersonally I recommend you Ncerts. Science,History All or you can go for Lucents book alsoBest part it will save your time.

English- 1 Hour Lucent English or any other grammer bookJust brush up your vocab. and grammer skills and do previous year papers.

Good Luck!