With a PSAT 10 score of 1300 from April 2018, what is the best way to prep for the PSAT/NMSQT?

Any advice is appreciated! Book recommendations? websites?
680 Verbal 620 Math, no prep yet, finishing Alg2/Trig next week. 15 year old sophomore, turning 16 in July.
Not much planned for the summer, just plan to chill and maybe do a section a day from both math and verbal.
Any prep strategies are appreciated. Thanks!

Link your College Board account with Khan Academy, it’s free and it’ll give you practice based on what you missed on PSAT