Another site:
AllTop 200 most popular tests to learn English...
1) Test de niveau anglais (webmaster) 6 783 472
2) Placement test : grammar for beginners (anonyme) 6 001 392
3) A/AN (webmaster) 5 370 703
4) Auxiliary BE (webmaster) 3 226 943
5) Present continuous (webmaster) 3 002 909
6) Present simple (webmaster) 2 925 088
7) Present simple (webmaster) 2 600 933
8) Present continuous (webmaster) 2 440 507
9) Adjectives (webmaster) 2 095 310
10) A/an (anonyme) 2 018 456
11) Present perfect simple (webmaster) 1 650 067
12) Preterite (webmaster) 1 636 694
13) Vocabulary - Placement test (bridg) 1 620 799
14) Preterite (webmaster) 1 452 556
15) Short placement test (webmaster) 1 444 966
16) To be (bridg) 1 407 951
17) Present perfect (webmaster) 1 351 618
18) What time is it? (webmaster) 1 351 097
19) The alphabet in English (webmaster) 1 322 670
20) Adjectives (anonyme) 1 217 597
21) What time is it? (webmaster) 1 211 570
22) Numbers (webmaster) 1 189 588
23) 'A' ou 'An' (anonyme) 1 177 828
24) Two presents: present continuous, present simple (webmaster) 1 151 451
25) To be (bridg) 1 146 935
26) Comparatives / Superlatives (webmaster) 1 110 040
27) Numbers (webmaster) 1 072 351
28) CAN / MUST (webmaster) 1 059 905
29) THE/ A / AN / nothing (webmaster) 1 036 358
30) Comparatives (webmaster) 1 008 420
31) Family life (bridg) 1 002 188
32) Numbers > 100 (webmaster) 987 523
33) Future (going to/will/present continuous) (anonyme) 966 443
34) Plural (webmaster) 957 056
35) Superlatives (webmaster) 876 443
36) Adjectives (anonyme) 875 991
37) Simple present (bridg) 855 478
38) Spelled words N°1 (bridg) 851 375
39) Placement test beginners: Check your spelling (anonyme) 830 777
40) Introducing oneself (webmaster) 827 987
41) Adverbs of frequency (anonyme) 819 499
42) Family (bridg) 785 867
43) General test-End of high school / Beginning of university (webmaster) 783 990
44) Present simple (anonyme) 783 743
45) Frequency adverbs (webmaster) 778 810
46) Present BE + Ving (bridg) 766 994
47) Passive form (anonyme) 731 119
48) Genitive (webmaster) 724 506
49) Family tree (anonyme) 720 348
50) Preterite: simple or continuous? (webmaster) 718 392
51) Placement test (beginners) (lili73) 702 645
52) Past simple or present perfect (anonyme) 697 373
53) Future (webmaster) 676 773
54) Present perfect simple (bridg) 664 691
55) 2 Preterites (webmaster) 663 857
56) Preterite (webmaster) 622 752
57) List of 200 irregular verbs and audio (bridg) 617 519
58) Modals (webmaster) 613 499
59) Spelled words N°2 (bridg) 610 130
60) Modals (webmaster) 608 143
61) Height (webmaster) 606 969
62) Articles a / an / the (anonyme) 596 783
63) Plural forms (bridg) 578 620
64) Nationalities (webmaster) 575 080
65) Past continuous / Past simple (anonyme) 569 670
66) Irregular plurals (bridg) 554 633
67) Two presents: simple and continuous (webmaster) 550 551
68) Preterite (bridg) 550 079
69) Superlatives (frapedur) 542 142
70) Vocabulary: greeting people (here4u) 536 583
71) Give your opinion (bridg) 532 880
72) Adverbs of Frequency (bridg) 517 757
73) Present simple or continuous (anonyme) 513 407
74) Present perfect / preterite ? (anonyme) 512 497
75) Possessive case (anonyme) 481 412
76) Countries & nationalities (bridg) 474 384
77) Past tenses (bridg) 472 212
78) 'The' or nothing? (webmaster) 471 826
79) Introducing oneself (easy) (webmaster) 471 282
80) Passive voice (webmaster) 464 958
81) Present Simple vs. Past Simple (anonyme) 460 183
82) Questions : how to ask them (anonyme) 449 162
83) General Test II / End of high school / Beginning of universi (webmaster) 446 822
84) IN, ON, AT or TO? (webmaster) 446 358
85) Relative pronouns (webmaster) 446 069
86) Comparative of superiority (anonyme) 440 639
87) How to pronounce the final -ED? (past simple) (webmaster) 439 536
88) Relative clauses (webmaster) 424 214
89) Sounds: [h] (webmaster) 419 980
90) Comparative (anonyme) 415 319
91) Past simple (anonyme) 400 379
92) A/an/Ø (bridg) 399 729
93) Future simple (anonyme) 397 679
94) This / That / These / Those (webmaster) 393 164
95) Conditional (webmaster) 392 691
96) Passive voice (anonyme) 391 842
97) Comparing (webmaster) 388 546
98) Can / could/ may/ might (woodyrun) 380 638
99) Present perfect or past tense (anonyme) 379 200
100) Much, many, little and few (felin) 374 675
101) Personal pronouns (anonyme) 371 675
102) Preterite continuous (BE + -ING) (webmaster) 371 017
103) Genitive case (bridg) 368 988
104) Some, any, no, enough, too/too much/too many (webmaster) 368 670
105) Confusing words - Placement test (bridg) 364 943
106) Irregular verbs (webmaster) 364 454
107) Numbers from 1 to 10 (anonyme) 362 022
108) Past perfect simple, past perfect continuous (anonyme) 361 214
109) Present continuous or present simple (webmaster) 360 077
110) Present perfect or preterite? (anonyme) 358 827
111) Simple Past : regular verbs (anonyme) 354 740
112) Comparative Adjectives (bridg) 352 723
113) Who, Whom, Which, or Whose? (anonyme) 349 745
114) Past simple (video) (anonyme) 349 404
115) Past simple or past continuous (anonyme) 345 458
116) While / When (anonyme) 340 696
117) What time is it? (webmaster) 338 552
118) Modals (tinou) 337 174
119) Modal: may/might (anonyme) 334 688
120) Cardinal and ordinal numbers (anonyme) 329 227
121) The superlative (anonyme) 327 630
122) Possessive adjectives and pronouns (woodyrun) 324 977
123) How to talk about the weather (lili73) 320 961
124) Since and for (anonyme) 319 711
125) Flags (webmaster) 318 058
126) Irregular verbs (bridg) 316 631
127) Pronouns (woodyrun) 315 355
128) Prepositions - in, on, at (anonyme) 314 545
129) Tenses (anonyme) 312 913
130) Placement test 3 (webmaster) 310 917
131) Order of adjectives (webmaster) 307 029
132) Could/Couldn't (laure95) 306 668
133) Comparative (anonyme) 305 310
134) Adjectives and prepositions (anonyme) 304 530
135) Agreement Tags (webmaster) 304 473
136) Asking questions (webmaster) 303 639
137) Present perfect OR simple past? (bridg) 298 810
138) Questions in the past tense (anonyme) 298 425
139) Uncountable nouns (webmaster) 296 474
140) Superlative Adjectives (bridg) 296 323
141) Object pronouns (bridg) 296 206
142) Passive form (anonyme) 293 798
143) Placement test 1 (anonyme) 293 333
144) Present simple (anonyme) 292 149
145) Can/Must/Should (laure95) 291 139
146) Past perfect (lili73) 290 379
147) Prefer/rather (bridg) 290 046
148) Must or Have to? (woodyrun) 288 378
149) The/an/nothing (bridg) 285 788
150) To be (anonyme) 283 645
151) Can and can't (laure95) 282 937
152) Vocabulary: asking and answering (here4u) 280 494
153) Modal verbs (bridg) 277 649
154) Some / Any / no... (bridg) 275 059
155) Days of the week (bridg) 269 201
156) So / neither (anonyme) 264 600
157) Past simple (video) (anonyme) 264 112
158) Present continuous (chnawa) 261 882
159) Used to (bridg) 260 572
160) Should / must (anonyme) 260 253
161) Past tense (anonyme) 259 711
162) Vocabulary: on the phone (here4u) 258 817
163) Find out a quantity (webmaster) 258 764
164) Articles : a / an / the / Ø (anonyme) 258 362
165) Superlative + and adjective (anonyme) 257 799
166) Comparative and superlative (anonyme) 257 169
167) Numbers 1/100 (anonyme) 253 945
168) Modal can (video) (anonyme) 253 384
169) Comparatives (anonyme) 251 104
170) Relatives pronouns (who, which, that...) (anonyme) 247 892
171) A few, a little, few, little (anonyme) 246 325
172) Vocabulary: at the restaurant (here4u) 245 709
173) Would rather / would prefer to (anonyme) 244 795
174) Present continuous and the Going to form (anonyme) 243 228
175) Should/ have to/ must (anonyme) 241 000
176) Have something done (anonyme) 240 123
177) Used to/would (woodyrun) 238 248
178) The past (webmaster) 238 027
179) Future continuous and future perfect. (felin) 237 995
180) How to ask a question in English (bridg) 236 078
181) Pluperfect (webmaster) 234 452
182) I wish, if only (felin) 234 340
183) Some / any (younes91) 233 996
184) Countable or Uncountable? (webmaster) 233 781
185) Should / shouldn't (anonyme) 231 994
186) Present simple or continuous (bridg) 230 834
187) Adjectives - ing and ed (felin) 229 464
188) Hypothesis (webmaster) 228 658
189) Must or mustn't (laure95) 226 829
190) Auxiliary BE (anonyme) 226 616
191) Articles a/an/the/0 (bridg) 226 468
192) Article The or nothing (anonyme) 226 273
193) Present perfect with Ever - never - (anonyme) 226 150
194) Present continuous OR Present simple? (bridg) 225 713
195) Simple Preterite OR Preterite (BE+ing) (webmaster) 223 137
196) Comparison (komiks) 221 061
197) To / in order to / so as to / so that (irish21) 221 037
198) Present perfect (bridg) 219 793
199) What time is it ? (anonyme) 217 904
200) Indirect speech (bridg) 217 853
