1- Switch off your Mobile.
2- Press & Hold Power and Volume up key to enter recovery mode.
3- Select Wipe data/Factory reset.
4- Select Yes-delete all user data.
5- Reboot the Canvas Spark.
6- Set up the initial setting, your mobile is now free from pattern.
Micromax Canvas Spark has following Specification:-
• Android Lollipop
• 8 MP Rear camera
• 1.3 GHz Quad Core processor