Dear Student,

For clearing the Part-1 of the NDA examination i.e; written exam of mathematis and General ability test(GAT). You can prepare in the following steps.

1. Start preparing Mathematics of class -9 to class-12 and specially give concern to NCERT books and R.D Sharma for NDA-1(MATHEMATICS)
2. For NDA-2(GAT) exam go through General English with proper grammer, giving attentions on topics like idioms,phrases, adjectives,tense, editing and omissions, antonyms and synonyms, prepositions, conjunctions and jumbled statements.
3. And for other subjects you should have to go through from the Textbooks of class-8 to class-12 of the subjects science and social science.
4. For general knowledge you should read newspaper daily
5. You can also purchase some preparatory books of arihant publications to get all the content without searching here and there.

If you follow all these steps then you will be able to clear your NDA Examination in one go with great scoring.

Hope this information helps you.

In case of any doubts you can comment me.

Thank You and Good luck.