In order to score good marks in JEE Main paper 2 make sure your concepts are clear if not start working on it. 

You can refer your text book of 11th and 12th class for maths especially. 

For drawing test you should start working on yoir observation and drawing skills. 

You can also make your important notes which will help you at the time of revision. 

You can refer below recommended books for your preparation

1- A complete guide for B.Arch by Arihant Publication

2- Verbal & Non Verbal Reasoning Book by R.S. Aggarwal

3- Architecture Entrance Book by P.K. Mishra.

All the Best!!