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What are good guitar exercises to start playing Metal solos?

I’ve been playing guitar for 2 1/2 years and I can play a lot metal riffs but when I get to the solos I can do any thing so what are good exercises to improve my fingers in that area. I also struggle with songs that have intricate rhythms, particulary megadeth songs. I know minor pentatonic, major and minor harmonic and minor melodic scales. I play mostly thrash metal songs.

well its good to frequently practice try some of these:

E |-15p12—12——————————————-
B |———-15–15p12—12———————————–
G |————————14—14p12—12————————-
D |—————————————-14—14p12–12—————
A |——————————————————14—14p12—12—–
E |———————————————————————-15—15p12
or

E |-0h2h3-0h3h5-0h5h7-0h3h5-0h2h3————————
B |——————————————————
G |——————————————————
D |——————————————————
A |——————————————————
E |——————————————————

This is part of the solo in Ride The Lightning
E |-19p15—15-]-17p14—14-]-15p12—12-]-14p11—14—-
B |———17—-]———–15—-]———-13—-]———12——-
G |————]————]————]—————
D |————]————]————]—————
A |—-4x——]—-4x——]—–4x—–]—-4x———
E |————]————]————]—————

its also good to "race" a metronome

hope this helps